G.d. Searle & Company

Mark Laurence Boys

James R Behling

Sean T Nugent

Payman N Farid

Pierre-Jean Colson

Ravindra S Topgi

Joseph Edward Duran

Kimberly Jo Cain-Janicki

Frank Walter Muellner

Wendel William Doubleday

Carl Matthew Knable

The invention herein is directed to a process for the preparation of ethyl 3S-amino-4-pentynoate which involves treating 3-(trimethylsilyl)-2-propynal with L-phenylglycinol in toluene to produce .alpha.S-��3-(trimethylsilyl)-2-propynylidene amino!benzenethanol; reacting .alpha.S-��3-(trimethylsilyl)-2-propynylidene!amino!benzenethanol with BrZnCH.sub.2 CO.sub.2 t-Bu in THF/NMP to produce 1,1-dimethylethyl 3S-�(2-hydroxy-1S-phenylethyl)amino!-5-(trimethylsilyl)-4-pentynoate; reacting the 1,1-dimethylethyl 3S-�(2-hydroxy-1S-phenylethyl)amino!-5-(trimethylsilyl)-4-pentynoate with sodium periodate to form 1,1-dimethylethyl 3S-�(phenylmethylene)amino!-5-(trimethylsilyl)-4-pentynoate; hydrolyzing 1,1-dimethylethyl 3S-�(phenylmethylene)amino!-5-(trimethylsilyl)-4-pentynoate to produce 1,1-dimethylethyl 3S-amino-5-(trimethylsilyl)-4-pentynoate; transesterifying 1,1-dimethyl 3S-amino-5-(trimethylsilyl)-4-pentynoate and desilylating to produce ethyl 3S-amino-4-pentynoate.

Asymmetric synthesis of chiral beta-amiNo acids

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Mt. Prospect, IL, United States of America

Mark Laurence Boys