of (bacterio)chlorophylls, two routes to 2-iodo-3-methyl-4-(3-methoxy-1,3-dioxopropyl)pyrrole, a precursor of the universal ring C, have been developed. The β-ketoester of ring C is expected to give rise to ring E upon Knoevenagel condensation and Nazarov cyclization with a ring D constituent as demonstrated in an analogue synthesis. Two viable routes were developed beginning with N-TIPS-pyrrole or with
作为开发实用的(细菌)叶绿素家族成员的计划的一部分,有两种途径可制得2-
碘-3-甲基-4-(3-甲氧基-1,3-二氧丙基)
吡咯(2-
碘-3-甲基-4-(3-甲氧基-1,3-二氧丙基))
吡咯已开发出通用环C。如在模拟合成中所证明的,预期在Cnoevenagel缩合和具有D环成分的纳扎罗夫环化时,环C的β-
酮酸酯会生成环E。从N -
TIPS-
吡咯或4-氧代-
2-戊烯和TosMIC开始,开发了两条可行的路线,从而提供了表面上看似简单的
吡咯的克数。