A Novel Approach to Erythrinan Alkaloids by Utilizing Substituted Biphenyl as Building Block
作者:Takashi Matsumoto、Yoshizumi Yasui、Yukiko Koga、Keisuke Suzuki
DOI:10.1055/s-2004-817753
日期:——
Aryl ortho-quinone monoacetal 6 possessing a carbamate group on the side chain Was synthesized from the appropriate biphenyl precursor via selective oxidation of one of the aromatic rings. Under Lewis acidic conditions, the carbamate group underwent internal attack at the quinone acetal moiety to give the spiro tricycle 9 corresponding to the A-. C-, and D-rings of erythrinan alkaloids, from which
在侧链上具有氨基甲酸酯基团的芳基邻醌单缩醛6是由合适的联苯前体通过芳环之一的选择性氧化合成的。在路易斯酸性条件下,氨基甲酸酯基团在醌缩醛部分发生内部攻击,得到对应于A-的螺三环9。赤藓糖苷生物碱的 C 环和 D 环,其中 O-甲基赤藓二烯酮以有效的方式通过 B 环形成合成。