Florida International University

Md Abu Hasan Howlader

Stanislaw F Wnuk

Barry P Rosen

Masafumi Yoshinaga

Sk Md Sazzad Hossain Suzol

The subject invention provides methods for the chemical synthesis of racemic arsinothricin (D,L-AST), the novel organoarsenical antibiotic. One is by condensation of the 2-chloroethyl(methyl)arsinic acid with acetamidomalonate, and the second involves reduction of the N-acetyl-protected derivative of hydroxyarsinothricin (AST-OH) and subsequent methylation of the resulting sodium salt of trivalent arsenic intermediate with methyl iodide. The enzyme AST N-acetyltransferase (ArsN1) was utilized to purify L-AST from racemic AST. This expedient chemical synthesis of AST provides a source of this novel antibiotic for future drug development.

Chemical synthesis of the organoarsenical antibiotic arsinothricin

The subject invention provides methods for the chemical synthesis of racemic arsinothricin (D,L-AST), the novel organoarsenical antibiotic. One is by condensation of the 2-chloroethyl(methyl)arsinic acid with acetamidomalonate, and the second involves reduction of the N-acetyl-protected derivative of hydroxyarsinothricin (AST-OH) and subsequent methylation of the resulting sodium salt of trivalent arsenic intermediate with methyl iodide. The enzyme AST N-acetyltransferase (ArsNl) was utilized to purify L-AST from racemic AST. This expedient chemical synthesis of AST provides a source of this novel antibiotic for future drug development.

The subject invention provides methods and procedures for synthesis and/or semi-synthesis of the novel antibiotic arsinothricin (AST) and derivatives. Arsinothricin (AST), a new broad-spectrum organoarsenical antibiotic, is a non-proteinogenic analog of glutamate that effectively inhibits glutamine synthetase. The subject invention provides chemical synthesis of an intermediate in the pathway of AST synthesis, hydroxyarsinothricin (AST-OH), which can be converted to AST by enzymatic methylation catalyzed by the ArsM As(III) S-adenosylmethionine methyltransferase. The methods provide a source of the novel antibiotic that will be required for future clinical trials. The subject invention also provides AST derivatives as a new class of antibiotics.

Synthesis of the organoarsenical antibiotic arsinothricin and derivatives thereof

The subject invention provides an expedited synthesis of 5, 6, and 7-iodoindenes from the corresponding aminoindan-1-ones in more than 70% yield, employing readily available precursors and reagents. A three-step sequence involves diazotization-iodination of aminoindan-1-one followed by reduction and dehydration. The method has a general character and can be extended for the preparation of various 4-, 5-, 6- or 7-haloindenes using different halogen sources for diazotization-halogenation reaction.

Growing community of inventors

Miami, FL, United States of America

Md Abu Hasan Howlader