Auxiliary-controlled stereoselective enolate protonation: Enantioselective synthesis of cis and trans annulated decahydroquinoline alkaloids
作者:Markus Weymann、Martin Schultz-Kukula、Horst Kunz
DOI:10.1016/s0040-4039(98)01745-6
日期:1998.10
The diastereoselective synthesis of the octahydroquinoline enone precursor of pumiliotoxin C is achieved via tandem Mannich-Michael reaction on N-galactosyl imines. Conjugate cuprate addition to the bicyclic enone stereoselectively forms the trans annulated 4a-epi-pumiliotoxin C skeleton in the presence of the carbohydrate auxiliary, and the cis annulated pumiliotoxin C skeleton in its absence.
铝毒素C的八氢喹啉烯酮前体的非对映选择性合成是通过在N-半乳糖基亚胺上的串联曼尼希-迈克尔反应实现的。在双糖烯酮的存在下,向双环烯酮立体共轭添加铜酸盐选择性地形成了反式环化的4a-表位-pumiliotoxin C骨架,在不存在顺式环化的pumiliotoxin C骨架时。