Pictet-Spengler condensation of N-sulfonyl-β-phenethylamines with α-chloro-α-phenylselenoesters. New synthesis of 1,2,3,4-tetrahydroisoquinoline-1-carboxylates
作者:Claudio C. Silveira、Carmem R. Bernardi、Antonio L. Braga、Teodoro S. Kaufman
DOI:10.1016/s0040-4039(99)00958-2
日期:1999.7
The reaction of N-sulfonyl-β-phenethylamines with α-chloro-α-phenylseleno acetate/propionate esters under Lewis acid promotion gives moderate to good yields of the corresponding 1,2,3,4-tetrahydroisoquinoline-1-carboxylates. Varying degrees of diastereoselection were obtained using chiral sulfonamides and/or esters. Employing this strategy, the achievement of a new total synthesis of Calycotomine is
在路易斯酸促进下,N-磺酰基-β-苯乙胺与α-氯-α-苯基硒代乙酸/丙酸酯的反应产生相应的1,2,3,4-四氢异喹啉-1-羧酸酯中等至良好的产率。使用手性磺酰胺和/或酯可得到不同程度的非对映选择性。据报道,采用这种策略,可以实现新的全合成卡托乙胺的合成。