The enzymatically derived and enantiopure cis-1,2-dihydrocatechol 1 has been converted, over 14 one-pot operations, into the (+)-form of the alkaloid narseronine (2). The present study, which complements earlier work that established a route from metabolite 1 to enantiomer (–)-2, involves an N-bromosuccinimide/tri-n-butyltin hydride-mediated cyclisation reaction to construct the unsaturated B-ring lactone of the target compound.
通过酶法衍生出的对映体纯顺式-1,2-二氢邻苯二酚 1 经过 14 次一锅操作转化为生物碱纳塞龙宁的 (+)- 型 (2)。本研究是对早期工作的补充,早期工作建立了从代谢物 1 到对映体 (-)-2 的路线,涉及 N-溴琥珀酰亚胺/三正丁基锡氢化物介导的环化反应,以构建目标化合物的不饱和 B 环内酯。