Preparation of (<i>R</i>)-11-hydroxyaporphine directly from (<i>R</i>)-10,11-dihydroxyaporphine ((R)-apomorphine)
作者:Jack C. Kim、Sang-Duk Bae、Ji-A Kim、Soon-Kyu Choi
DOI:10.1002/jhet.5570350307
日期:1998.5
A Regioselective synthesis of (R)-11-hydroxyaporphine 2 directly from (R)-10,11-dihydroxyaporphine ((R)-apomorphine, 1) is described for the first time. The isopropylidene ketal ring of 10,11-(isopropyl-idenyldioxy)aporphine 5 obtained by the isopropylidenation of apomorphine was regioselectively opened by ten equivalents of trimethylaluminum to give (R)-10-hydroxy-11-tert-butyloxyaporphine 6. The
首次描述了直接从(R)-10,11-二羟基aporphine((R)-阿扑吗啡1)的区域选择性合成(R)-11-羟基aporphine 2。-10,11-(异丙基- idenyldioxy)阿朴啡的异丙基缩酮环5由阿朴吗啡的isopropylidenation得到区域选择性地通过三甲基10当量打开,以得到(- [R)-10-羟基-11-叔-butyloxyaporphine 6。在回流下,用N-苯基三氟甲烷磺酰亚胺和碳酸钾将6的游离10-羟基取代,得到(R)-10-[(三氟甲基)磺酰氧基] -11-叔丁氧基甲吗啡7。通过钯催化的氢解由7制备还原的产物11-叔丁氧基甲吗啡8。用48%氢溴酸裂解(R)-11-叔丁氧基甲吗啡的醚以良好的收率提供了所需的(R)-11-羟基aporphine 2。