Alkylation of<i>N</i>-boc-1,2,3,4-tetrahydroisoquinolines in the 1-position and its application to the synthesis of isoquinoline alkaloids
作者:Gary M. Coppola
DOI:10.1002/jhet.5570280720
日期:1991.11
Reaction of the anion with alkyl halides provides 1-alkyl N-Boc-1,2,3,4-tetrahydroisoquinolines in 67–71% yield. The protecting group is easily removed in high yield with trifluoroacetic acid. The alkaloids salsolidine (8) and laudanosine (11) were synthesized in racemic form using this method.
Boc保护的1,2,3,4-四氢异喹啉2可以在N,N,N',N'-四甲基乙二胺存在下用叔丁基锂进行锂化。阴离子与烷基卤的反应可提供1-烷基N -Boc-1,2,3,4-四氢异喹啉,产率为67-71%。用三氟乙酸容易以高收率除去保护基。使用该方法以消旋形式合成了生物碱salsolidine(8)和laudanosine(11)。