Enantiomerically pure tetrahydroisoquinolines by enzyme catalysis and gold-catalyzed phenol synthesis
作者:A. Stephen K. Hashmi、Filiz Ata、Patrick Haufe、Frank Rominger
DOI:10.1016/j.tet.2008.12.058
日期:2009.2
Five different furfural derivatives were converted to chiral cyanohydrins by enzyme catalysis in good enantiomeric excess. After a sequence of silyl protection, nitrile reduction, tosylation and propargylation, substrates for the gold(I) catalyzed cycloisomerization of δ-alkynyl furans delivered good yields of enantiomerically pure dihydroxytetrahydroisoquinoline building blocks. Neither racemization
通过良好的对映体过量,通过酶催化将五种不同的糠醛衍生物转化为手性氰醇。经过一系列的甲硅烷基保护,腈还原,甲苯磺酸酯化和炔丙基化反应后,金(I)催化的δ-炔基呋喃环异构化反应的底物获得了对映体纯的二羟基四氢异喹啉结构单元良好的收率。既没有消旋也没有消除喹啉。