Enantioselective Approach to Tropane Skeleton: Synthesis of (1<i>S</i>,5<i>S</i>,6<i>R)</i>-6-Hydroxy-8-methyl-8-azabicyclo[3.2.1]octan-3-one
作者:Gian Pollini、Carmela De Risi、Flavio Lumento、Paolo Marchetti、Vinicio Zanirato
DOI:10.1055/s-2004-836037
日期:——
The original and classical Mannich-type construct for the tropane skeleton, developed over half a century ago by Willstätter, Robinson and Schöpf as the first biomimetic synthesis, has been employed for the enantioselective construction of 6β-hydroxytropinone. The component compounds of this novel one-step Mannich-type condensation sequence are acetonedicarboxylic acid, methylamine hydrochloride and (2R)-hydroxy-1,4-butanedial, in turn prepared from tert-butyl (R)-3-hydroxy-4-pentenoate as the starting chiral synthon.
半个多世纪前,Willstätter、Robinson 和 Schöpf 作为第一个仿生合成方法,开发出了用于对位选择性合成 6δ²-羟基托品酮的原始经典曼尼希式托品骨架结构。这种新颖的一步曼尼希式缩合顺序的组成化合物是丙酮二羧酸、盐酸甲胺和(2R)-羟基-1,4-丁二醛,而(2R)-羟基-1,4-丁二醛又是以(R)-3-羟基-4-戊烯酸叔丁酯为起始手性合成物制备的。