Lewis acid complexed heteroatom carbanions; a convenient route to α-hydroxybenzyltetrahydroisoquinoline alkaloids
作者:S.V. Kessar、Rahul Vohra、Nachhattar Pal Kaur
DOI:10.1016/s0040-4039(00)79728-0
日期:1991.7
Treatment of the BF3 complex of 6,7-methylenedioxy-2-methyltetrahydroisoquinoline (2) with sec-butyllithium followed by addition of piperonal gave α -hydroxybenzyltetrahydroisoquinolines 3a and 3b, while addition of 3,4-methylenedioxyphthaldehyde (4) afforded alkaloids (±)corytensine (5) and (±) egenine (6) along with isomeric hemiacetals 7 and 8.