A novel and versatile method for the enantioselective syntheses of tropane alkaloids
作者:ZhongYi Mao、SuYu Huang、LongHui Gao、AiE Wang、PeiQiang Huang
DOI:10.1007/s11426-013-4998-2
日期:2014.2
materials, this two-step method consists of silyl enol ether formation with TBDMSOTf, lactam activation with Tf2O/DTBMP, and halide-promoted cyclization. Radical dechlorination of the resulting 1-halotropan-3-ones led to the corresponding hydroxylated tropan-3-ones, which can be hydrogenated to yield 3α,6β-dihydroxytropanes. Starting from optically active keto-lactams, the method has been applied to the
完整地介绍了新颖和灵活的方法来羟基化8-azabicyclo [3,2,1] octan-3-ones和9-azabicyclo [3,3,1] nonan-3-ones。以酮内酰胺为原料,此两步方法包括用TBDMSOTf形成甲硅烷基烯醇醚,用Tf 2 O / DTBMP活化内酰胺和卤化物促进的环化反应。所得的1-卤代泛-3-酮的自由基脱氯导致相应的羟基化的tropan-3-酮,其可以被氢化以产生3α,6β-二羟基tropanes。从旋光性酮-内酰胺类化合物开始,该方法已应用于(+)-(1 S,3 S,5 R,6 S)-Pervilleine C(6),(+)-(1 S)的对映选择性合成,3 R,5 S,6 R)-缬氨酸(3),(+)-(1 S,3 S,5 R,6 S)-二苯甲酰氧托烷(8)和(+)-(1 S,3 S,5 R,6 S)-美的地辛(9)。