Asymmetric Total Synthesis of (-)-Octahydro-1<i>H</i>-benzofuro[3,2-<i>e</i>]isoquinoline, A Partial Structure of Morphine
作者:Ling-Wei Hsin、Chien-Wei Chen、Li-Te Chang
DOI:10.1002/jccs.200500051
日期:2005.4
Octahydro-1 H-benzofuro[3,2-e]isoquinolines, which possess the ACNO partial structure of morphine, displayed potent oral analgesic and narcotic-antagonism activity. However, due to inefficiency in their synthesis the ACNO derivatives have not been developed for clinical use. Here, we report in detail the first asymmetric total synthesis of (-)-octahydro-1 H-benzofuro[3,2-e]isoquinoline as exemplified by the
Octahydro-1 H-benzofuro[3,2-e]isoquinolines 具有吗啡的 ACNO 部分结构,显示出有效的口服镇痛和麻醉拮抗活性。然而,由于其合成效率低下,ACNO 衍生物尚未开发用于临床。在这里,我们详细报道了 (-)-octahydro-1 H-benzofuro[3,2-e]isoquinoline 的第一次不对称全合成,例如 (-)-1 和 (-)-2 的制备。关键中间体 (+)-5-羟基-3,4,5,6,7,8-六氢-1 H-异喹啉-2-羧酸乙酯 ((+)-5) 以 81% 的收率和通过使用 RuCl[(R,R)-Tsdpen 不对称还原 5-oxo-3,4,5,6,7,8-hexahydro-1 H-isoquinoline-2-carboxy 酸乙酯 (6) 得到 100% ee ](对甲基异丙基苯)作为催化剂,S/C 为 200。