Stereoselective synthesis of methoxy substituted 1,2,3,4,4a,5,10,10a-octahydrobenzo[g]quinolines
作者:Charlotta Mellin、Uli Hacksell
DOI:10.1016/s0040-4020(01)87725-5
日期:1987.1
The preparation of the cis- and trans-isomers of 6- and 9-methoxy-1,2,3,4,4a,5,10,10a-octahydrobenzo[g]-quinoline is reported. The syntheses involved reductions of cyclic iminium chlorides, which afforded the diastereomers conveniently and in good yields. Small cis/trans ratios were obtained with NaCNBH3 as the reducing agent. Catalytic hydrogenation using PtO2 in THF or t-BuOH gave the largest cis/trans
报道了6-和9-甲氧基-1,2,3,4,4a,5,10,10a-八氢苯并[g]-喹啉的顺式和反式异构体的制备。合成涉及环状亚氯化亚胺的还原,这方便地且以高收率提供了非对映异构体。用NaCNBH 3作为还原剂可获得小的顺式/反式比率。使用PtO 2在THF或t-BuOH中的催化加氢得到最大的顺式/反式比。制备N-苄基衍生物以允许确定相对立体化学。