A divergent strategy for synthesis of the tetrahydroisoquinoline alkaloids renieramycin G and a lemonomycin analog
作者:Philip Magnus、Kenneth S. Matthews
DOI:10.1016/j.tet.2012.02.043
日期:2012.8
A divergent synthesis to the tetrahydroisoquinoline alkaloids (±)-renieramycin G and (±)-lemonomycinone amide is reported. A strategy was developed that allowed access to both the diazabicyclo[3.3.1]nonane and diazabicyclo[3.2.1]octane ring systems of the respective targets from a common advanced intermediate. The high diastereoselectivity observed throughout the synthesis is controlled by the first
报道了四氢异喹啉生物碱(±)-雷尼霉素G和(±)-柠檬霉素酰胺的不同合成。开发了一种策略,该策略允许从同一高级中间体访问各自靶标的二氮杂双环[3.3.1]壬烷和二氮杂双环[3.2.1]辛烷环系统。在整个合成过程中观察到的高非对映选择性是由未活化异喹啉烷基化形成的第一个立体中心控制的。的主要结果包括异喹啉的不含钯的拉洛克条件下的合成,非对映选择性离子氢化条件设置1,3-顺-tetrahydroisoquinoline架构中,高度非对映reprotonation,和亲硫的路易斯酸催化的5-内切-三角函数Ñ-酰基亚胺离子甲硅烷基烯醇醚环化。对四氢异喹啉生物碱的这种发散方法为该天然产物家族中进一步的结构多样性提供了另一种策略。