Stereospecific Construction of Chiral Quaternary Carbon Compounds from Chiral Secondary Alcohol Derivatives
作者:Yukio Masaki、Hideki Arasaki、Masashi Iwata
DOI:10.1246/cl.2003.4
日期:2003.1
Chiral tertiary dichloromethylcarbinol derivatives, prepared by stereospecific α C–H insertion reaction of dichlorocarbene with protected chiral secondary alcohols, were converted into intermediary α-chloroepoxides which gave stereospecifically chiral quaternary carbon compounds, α-aminoacids via α-azide-aldehydes and α-cyanoacetic acids through cyanation, respectively. The fashion generating the quaternary
手性叔二氯甲基甲醇衍生物,通过二氯卡宾与受保护的手性仲醇的立体有择 α C-H 插入反应制备,转化为中间体 α-氯环氧化物,通过 α-叠氮醛和 α-氰乙酸生成立体有择手性季碳化合物、α-氨基酸酸分别通过氰化。事实证明,通过 α-氯环氧化物从二氯甲基甲醇生成季中心的方式因底物而异:非苄基底物的构型反转和苄基底物的表观保留。