tert.-butoxycarbonyl-D-methionine dicyclohexylamine salt
英文别名
dicyclohexylamine salt of N-t-butyloxycarbonyl D-methionine;dicyclohexylazanium;(2R)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-4-methylsulfanylbutanoate
Process for 4-(D-3-amino-3-carboxypropoxy)-phenylglyoxylic acid oxime
申请人:Eli Lilly and Company
公开号:US04355172A1
公开(公告)日:1982-10-19
Process for 4-(D-3-amino-3-carboxypropoxy)phenylglyoxylic acid oxime as an amino-protected ester comprising alkylating an amino-protected D-methionine silyl ester with an alkyl or benzyl iodide; cyclizing the alkylsulfonium iodide to an amino-protected D-homoserine lactone; hydrolyzing the lactone to an amino-protected D-homoserine in aqueous base; coupling, to form an ether, the amino-protected D-homoserine as an ester with an ester of 4-hydroxyphenylglyoxylic acid; and forming the oxime of the ether or alternatively coupling the D-homoserine ester with a protected-oxime of an esterified 4-hydroxyphenylglyoxylic acid. The product is useful in preparing the antibiotic FR 1923.