Pfizer Corporation

Thomas M Brennan

Donald E Kuhla

Paul D Weeks

Daniel P Brannegan

Michael E Hendrick

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is methyl, ethyl, n-propyl or isopropyl; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## where at least one of R.sup.3, R.sup.4, R.sup.5, R.sup.6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, X is O, S, SO, SO.sub.2 C.dbd.O or CHOH; m is zero or 1-4, n and p are each zero, 1, 2 or 3 where the sum of n+p is not greater than 3 and the sum of the carbon atoms in R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is not greater than six, and when both of R.sup.3 and R.sup.4 or R.sup.5 and R.sup.6 are alkyl they are methyl or ethyl, ##STR3## where one of R.sup.7, R.sup.8, R.sup.9 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms and the sum of the carbon atoms in R.sup.7, R.sup.8 and R.sup.9 is not greater than six, m and q are the same or different and each have the values previously defined for m; ##STR4## where each of R.sup.12 and R.sup.13 are methyl or ethyl, or R.sup.12 is hydrogen and R.sup.13 is alkyl having from one to four carbon atoms, Z is O or NH and t is 1 or 2, ##STR5## where w is 1-4, R.sup.14 and R.sup.16 are each alkyl having from one to four carbon atoms, R.sup.15 is H, OH, methyl or ethyl and the sum of the carbon atoms in R.sup.14, R.sup.15 and R.sup.16 is not greater than six and when both of R.sup.14 and R.sup.15 are alkyl they are methyl or ethyl, and ##STR6## where R.sup.17 and R.sup.19 are alkyl having from one to four carbon atoms, R.sup.18 and R.sup.20 are H or alkyl having one to two carbon atoms, A is OH and B is H, OH or CH.sub.3 and taken together A and B are ##STR7## where the sum of the carbon atoms in R.sup.17, R.sup.18, R.sup.19 and R.sup.20 is not greater than six and when both of R.sup.17 and R.sup.18 or R.sup.19 and R.sup.20 are alkyl they are methyl or ethyl; said amides are potent sweeteners having advantages over the prior art, edible compositions containing them, methods for their use in edible compositions and novel amine and amide intermediates useful in their production.

Branched amides of L-aspartyl-D-amino acid dipeptides

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is methyl, hydroxymethyl, ethyl, n-propyl or isopropyl; R is ##STR2## where at least one of R.sup.3, R.sup.4, R.sup.5, R.sup.6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, and the sum of the carbon atoms in R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is not greater than six; and when both of R.sup.3 and R.sup.4 or R.sup.5 and R.sup.6 are alkyl, they are methyl or ethyl. Said amides are potent sweeteners having advantages over the prior art, edible compositions containing them, methods for their use in edible compositions and novel amine and amide intermediates useful in their production.

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is methyl, ethyl, n-propyl or isopropyl; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## where at least one of R.sup.3, R.sup.4, R.sup.5, R.sup.6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, X is O, S, SO, SO.sub.2, C.dbd.O or CHOH; m is zero or 1-4, n and p are each zero, 1, 2 or 3 where the sum of n+p is not greater than 3 and the sum of the carbon atoms in R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is not greater than six, and when both of R.sup.3 and R.sup.4 or R.sup.5 and R.sup.6 are alkyl they are methyl or ethyl, ##STR3## where one of R.sup.7, R.sup.8, R.sup.9 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms and the sum of the carbon atoms in R.sup.7, R.sup.8 and R.sup.9 is not greater than six, m and q are the same or different and each have the values previously defined for m; ##STR4## where each of R.sup.12 and R.sup.13 are methyl or ethyl, or R.sup.12 is hydrogen and R.sup.13 is alkyl having from one to four carbon atoms, Z is O or NH and t is 1 or 2, ##STR5## where w is 1-4, R.sup.14 and R.sup.16 are each alkyl having from one to four carbon atoms, R.sup.15 is H, OH, methyl or ethyl and the sum of the carbon atoms in R.sup.14, R.sup.15 and R.sup.16 is not greater than six and when both of R.sup.14 and R.sup.15 are alkyl they are methyl or ethyl, and ##STR6## where R.sup.17 and R.sup.19 are alkyl having from one to four carbon atoms, R.sup.18 and R.sup.20 are H or alkyl having one to two carbon atoms, A is OH and B is H, OH or CH.sub.3 and taken together A and B are ##STR7## where the sum of the carbon atoms in R.sup.17, R.sup.18, R.sup.19 and R.sup.20 is not greater than six and when both of R.sup.17 and R.sup.18 or R.sup.19 and R.sup.20 are alkyl they are methyl or ethyl; said amides are potent sweetners having advantages over the prior art, edible compositions containing them, methods for their use in edible compositions and novel amine and amide intermediates useful in their production.

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is methyl, ethyl, n-propyl or isopropyl; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## where at least one of R.sup.3, R.sup.4, R.sup.5, R.sup.6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, X is O, S, SO, SO.sub.2, C.dbd.O or CHOH; m is zero or 1-4, n and p are each zero, 1, 2 or 3 where the sum of n+p is not greater than 3 and the sum of the carbon atoms in R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is not greater than six, and when both of R.sup.3 and R.sup.4 or R.sup.5 and R.sup.6 are alkyl they are methyl or ethyl, ##STR3## where one of R.sup.7, R.sup.8, R.sup.9 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms and the sum of the carbon atoms in R.sup.7, R.sup.8 and R.sup.9 is not greater than six, m and q are the same or different and each have the values previously defined for m; ##STR4## where each of R.sup.12 and R.sup.13 are methyl or ethyl, or R.sup.12 is hydrogen and R.sup.13 is alkyl having from one to four carbon atoms, Z is O or NH and t is 1 or 2, ##STR5## where w is 1-4, R.sup.14 and R.sup.16 are each alkyl having from one to four carbon atoms, R.sup.15 is H, OH, methyl or ethyl and the sum of the carbon atoms in R.sup.14, R.sup.15 and R.sup.16 is not greater than six and when both of R.sup.14 and R.sup.15 are alkyl they are methyl or ethyl, and where R.sup.17 and R.sup.19 are alkyl having from one to four carbon atoms, R.sup.18 and R.sup.20 are H or alkyl having one to two carbon atoms, A is OH and B is H, OH or CH.sub.3 and taken together A and B are ##STR6## where the sum of the carbon atoms in R.sup.17, R.sup.18, R.sup.19 and R.sup.20 is not greater than six and when both of R.sup.17 and R.sup.18 or R.sup.19 and R.sup.20 are alkyl they are methyl or ethyl;

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is CH.sub.2 OH or CH.sub.2 OCH.sub.3 ; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## where at least one of R.sup.3, F.sup.4, R.sup.5, R.sup.6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, X is O, S, SO, SO.sub.2, C.dbd.O or CHOH; m is zero or 1-4, n and p are each zero, 1, 2 or 3 where the sum of n+p is not greater than 3 and the sum of the carbon atoms in R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is not greater than six, and when both of R.sup.3 and R.sup.4 or R.sup.5 and R.sup.6 are alkyl they are methyl or ethyl, ##STR3## where one of R.sup.7, R.sup.8, R.sup.9 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms and the sum of the carbon atoms in R.sup.7, R.sup.8 and R.sup.9 is not greater than six, m and q are the same or different and each have the values previously defined for m; ##STR4## where each of R.sup.12 and R.sup.13 are methyl or ethyl, or R.sup.12 is hydrogen and R.sup.13 is alkyl having from one to four carbon atoms, Z is O or NH and t is 1 or 2, ##STR5## where w is 1-4, R.sup.14 and R.sup.16 are each alkyl having from one to four carbon atoms, R.sup.15 is H, OH, methyl or ethyl and the sum of the carbon atoms in R.sup.14, R.sup.15 and R.sup.16 is not greater than six and when both of R.sup.14 and R.sup.15 are alkyl they are methyl or ethyl, and ##STR6## where R.sup.17 and R.sup.19 are alkyl having from one to four carbon atoms, R.sup.18 and R.sup.20 are H or alkyl having one to two carbon atoms, A is OH and B is H, OH or CH.sub.3 and taken together A and B are ##STR7## where the sum of the carbon atoms in R.sup.17, R.sup.18, R.sup.19 and R.sup.20 is not greater than six and when both of R.sup.17 and R.sup.18 or R.sup.19 and R.sup.20 are alkyl they are methyl or ethyl;

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is CH.sub.2 OH or CH.sub.2 OCH.sub.3 ; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## where at least one of R.sup.3, R.sup.4, R.sup.5, R.sup.6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, X is O, S, SO, SO.sub.2, C.dbd.O or CHOH; m is zero or 1-4, n and p are each zero, 1, 2 or 3 where the sum of n+p is not greater than 3 and the sum of the carbon atoms in R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is not greater than six, and when both of R.sup.3 and R.sup.4 or R.sup.5 and R.sup.6 are alkyl they are methyl or ethyl, ##STR3## where one of R.sup.7, R.sup.8, R.sup.9 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms and the sum of the carbon atoms in R.sup.7, R.sup.8 and R.sup.9 is not greater than six, m and q are the same or different and each have the values previously defined for m; ##STR4## where each of R.sup.12 and R.sup.13 are methyl or ethyl, or R.sup.12 is hydrogen and R.sup.13 is alkyl having from one to four carbon atoms, Z is O or NH and t is 1 or 2, ##STR5## where W is 1-4, R.sup.14 and R.sup.16 are each alkyl having from one to four carbon atoms, R.sup.15 is H, OH, methyl or ethyl and the sum of the carbon atoms in R.sup.14, R.sup.15 and R.sup.16 is not greater than six and when both of R.sup.14 and R.sup.15 are alkyl they are methyl or ethyl, and ##STR6## where R.sup.17 and R.sup.19 are alkyl having from one to four carbon atoms, R.sup.18 and R.sup.20 are H or alkyl having one to two carbon atoms, A is OH and B is H, OH or CH.sub.3 and taken together A and B are ##STR7## where the sum of the carbon atoms in R.sup.17, R.sup.18, R.sup.19 and R.sup.20 is not greater than six and when both of R.sup.17 and R.sup.18 or R.sup.19 and R.sup.20 are alkyl they are methyl or ethyl;

2-Methyl-3-hydroxy-4H-pyran-4-one is prepared by contacting 1(2-furyl)-1-ethanol in aqueous solution with two equivalents of a halogen oxidant at room temperature and then heating until the hydrolysis of the formed 4-halo-dihydropyran intermediate is substantially complete. Other valuable related gamma-pyrones are prepared in analogous manner from appropriate alcohols.

Preparation of gamma-pyrones

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is methyl, ethyl, n-propyl or isopropyl; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## said amides are potent sweeteners having advantages over the prior art, edible compositions containing them, methods for their use in edible compositions and novel amine and amide intermediates useful in their production.

Branched amides of L-aspartyl-d-amino acid dipeptides

Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R.sup.a is CH.sub.2 OH or CH.sub.2 OCH.sub.3 ; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butyl-carbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## said amides are potent sweeteners having advantages over the prior art, edible compositions containing them, methods for their use in edible compositions and novel amide intermediates useful in their production.

2-methyl-3-hydroxy-4H-pyran-4-one is prepared by contacting 1(2-furyl)-1-ethanol in aqueous solution with two equivalents of a halogen oxidant at room temperature and then heating until the hydrolysis of the formed 4-halo-dihydropyran intermediate is substantially complete. Other valuable related gammapyrones are prepared in analogous manner from appropriate alcohols.

Intermediates for the preparation of gamma-pyrones

(2-methyl-3-hydroxy-4h-pyran-4-one is prepared by contacting 1(2-furyl)-1-ethanol in aqueous solution with two equivalents of a halogen oxidant at room temperature and then heating until the hydrolysis of the formed 4-halo-dihydro-pyran intermediate is substantially complete. Other valuable related gamma-pyrones are prepared in analogous manner from appropriate alcohols.

3,4-Dihalo-tetrahydrophyran-5-one useful as intermediates for the

2-Methyl-3-hydroxy-4H-pyran-4-one is prepared by contacting 1(2-furyl)-1-ethanol in aqueous solution with two equivalents of a halogen oxidant at room temperature and then heating until the hydrolysis of the formed 4-halo-dihydropyran intermediate is substantially complete. Other valuable related gammapyrones are prepared in analogous manner from appropriate alcohols.

Gamma-pyrones are prepared by contacting a 3-halo-furfuryl alcohol or a 3-alkoxy-furfuryl alcohol with one equivalent of a halogen, peracid or peroxide oxidant and then heating until hydrolysis of the formed 4-substituted-dihydropyran intermediate is substantially complete. Maltol (2-methyl-3-hydroxy-4H-pyran-4-one) is prepared by this process from 2(1-hydroxyethyl)-3-alkoxy furans or 2(1-hydroxyethyl)-3-halo-furans. Gamma-pyrones are also prepared by contacting the corresponding 3-substituted-2,5-dialkoxy-furfuryl alcohols with acid until conversion to the gamma-pyrones is substantially complete.

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Old Lyme, CT, United States of America

Thomas M Brennan