Cyano esters and azepinones
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United States of America Patent
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May 12, 1992
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N/A
app pub date -
May 30, 1991
filing date -
Apr 2, 1990
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Abstract
A cyano glycidic acid ester compound can be prepared by reaction of an alkyl haloester and a cyano-aldehyde in the presence of an alkali metal alkoxide; an amino-acid ester cyano compound can be prepared by reaction of the cyano glycidic acid ester compound and an attachable amino compound, and a cyclic amido-carbonyl cyano compound can be prepared by contact of the amino-acid ester cyano compound in a liquid medium with a heterogeneous acidic ion-exchange substance. For example, reaction of 4-cyanobenzaldehyde and methyl chloroacetate in the presence of sodium methoxide in methanol, followed by ice/acetic acid neutralization, prepares trans-3-(4-cyanophenyl)glycidic acid, methyl ester, which is reacted in toluene with 2-aminothiophenol to yield 2-hydroxy-3-(2-aminophenylthio)-3-(4-cyanophenyl)propionic acid, methyl ester, threo form, which is cyclized in an aqueous mixture into cis-2-(4-cyanophenyl)-3-hydroxy-2,3-dihydro-1,5-benzothiazepin-4(5H)-one by employing a sulfonated polystyrenedivinylbenzene ion-exchange resin in its acid form, e.g., Dowex 50X4-400, at cyclization yields exceeding 70 percent of theory. Compounds of this invention are useful pharmaceuticals.
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