Homocysteine analogs of the formula ##STR1## wherein P.sub.1 is a nitrogen protecting group and R.sub.6 is alkyl, substituted alkyl or benzyl are prepared by esterifying N-protected L-methionine, oxidizing, treating the resulting sulfoxide with an acid anhydride, treating the resulting product with an alkali metal hydroxide followed by removal of formaldehyde and the treatment with an acid anhydride or acid halide. The L-homocysteine analogs are useful as intermediates in the preparation of compounds containing a fused bicyclic ring.
本发明提供了一种公式为##STR1##的同型半胱
氨酸类似物,其中P.sub.1是氮保护基,R.sub.6是烷基,取代烷基或苄基,通过酯化N-保护的L-甲
硫氨酸,氧化,用酸酐处理所得的亚砜,用碱
金属氢氧化物处理所得的产物,随后除去
甲醛并用酸酐或酸卤化物处理。L-同型半胱
氨酸类似物在制备含有融合双环环的化合物的中间体中有用。