作者:John C. Hodges、Wei Wang、Frank Riley
DOI:10.1021/jo0499569
日期:2004.4.1
cyclization of an analogous ethyl ester (ethyl [2-(4-methoxybenzylideneamino)phenyl]acetate) under strongly basic conditions. N-Acylation, olefin dihydroxylation, and tert-butyl ester cleavage affords the spirocyclic lactone 18 as a pair of diastereomers. Isolation and characterization of individual diastereomers 18a and 18b are described.
碱促进[2-(苄叉基氨基)苯基]乙酸叔丁基酯的环化(13a),然后用烯丙基溴进行C3-烷基化,得到3-烯丙基-2-苯基-2,3-二氢-1H-吲哚-3-羧酸,叔丁酯(15b),以单一非对映异构体的形式高收率。该结果与先前的出版物相反,该出版物描述了在强碱性条件下类似乙酯([2-(4-甲氧基亚苄基氨基)苯基]乙酸乙酯的环化失败)。N-酰化,烯烃二羟基化和叔丁酯裂解提供螺环内酯18作为一对非对映体。描述了各个非对映体18a和18b的分离和表征。