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。