Enantioselective Synthesis of Tetrahydroprotoberberines and Bisbenzylisoquinoline Alkaloids from a Deprotonated α-Aminonitrile
作者:Nancy Blank、Till Opatz
DOI:10.1021/jo201871c
日期:2011.12.2
for the preparation of various alkaloids. Here, the preparation of the benzylisoquinolines (+)-laudanidine, (+)-armepavine, and (+)-laudanosine as well as the tetrahydroprotoberberines (−)-corytenchine and (−)-tetrahydropseudoepiberberine using Noyori’s asymmetric transfer hydrogenation are described. The dimeric alkaloids (+)-O-methylthalibrine and (+)-tetramethylmagnolamine were obtained from nonracemic
在受控条件下,可以在α位置对6,7-二甲氧基-1,2,3,4-四氢异喹啉-1-腈进行定量去质子处理。它的烷基化直接提供了3,4-二氢异喹啉,它们可以用作制备各种生物碱的起始原料。在此描述了使用Noyori的不对称转移氢化法制备苄基异喹啉(+)-月桂啶,(+)-阿帕品碱和(+)-月桂碱以及四氢原小ber碱(-)-鸟嘌呤和(-)-四氢伪紫ep碱的方法。在Ullmann二芳基醚合成中,从非外消旋前体获得二聚生物碱(+)- O-甲基thalibrine和(+)-四甲基木酚胺。