Synthetic studies relevant to biosynthetic research on vitamin B12. Part 11. Modification of the east and west building blocks and study of different assembly methods for synthesis of isobacteriochlorins
作者:Alan R. Battersby、Michael H. Block、Finian J. Leeper、Steven C. Zimmerman
DOI:10.1039/p19920002189
日期:——
The eastern and western building blocks required for the photochemical route to isobacteriochlorins have been synthesized by a C–C bond-forming step which leaves a cyano group on the bridge carbon, e.g.5. Two methods have been developed to remove this cyano residue which use retro-Mannich reactions to eliminate either an aminomethyl group, resulting from reduction of the nitrile, or the corresponding
通过化学键连接步骤合成了光化学方法生成异绿藻素所需的东部和西部结构单元,该步骤在桥碳上保留了一个氰基,例如5。已经开发出两种去除该氰基残基的方法,它们使用曼尼希逆反应来消除由腈还原产生的氨甲基或相应的磺酰胺基。还已经开发出两种有效的方法来进行异细菌氯霉素的合成的最终步骤。