Synthesis of 8-demethyl-8-formyl protoporphyrin IX and of 8-demethylprotoporphyrin IX
作者:Luis Sambrotta、Irene Rezzano、Graciela Buldain、Benjamín Frydman
DOI:10.1016/s0040-4020(01)89134-1
日期:1989.1
unsubstituted position of this porphyrin were however unsuccesful, when either N,N-diisobutyl formamide (Vilsmeier-Haak reaction) or dichloromethyl methyl ether (Friedel Crafts reaction) were used. The title porphyrins were obtained from the aforementioned 2,4-bis(β-chloroethyl) porphyrins by vinylation of the latter with base. 8-Demethyl-8-formyl protoporhyrin IX is a valuable intermediate to probe into
从2,4-双(β-氯乙基)-6-(β-乙氧基羰基乙基)的氧化环化反应制得8-去甲基-8-甲酰基-2,4-双(β-氯乙基)卟啉及其8-脱甲基衍生物。 )-7-(β-甲氧羰基乙基)-1',1,3,5,8-五甲基a,c-二甲苯二氢溴化物与氯化铜(II)在二甲基甲酰胺(DMF)中在碘和空气中存在。在这些反应条件下,环化在25℃发生,以25%的收率获得甲酰基卟啉以及以50%的收率获得的C-8未取代的卟啉。后者也可以通过在25°C下于DMF中用氯化铜(II)在DMF中进行氧化环化而获得65%的收率,将β-未取代的1,7-双(β-氯乙基)-4-(β-甲氧基羰基乙基)- 5-(β-乙氧基羰基乙基)-1',2,6,8,8'-五甲基-a,c-比拉二烯二氢溴化物。然而,当使用N,N-二异丁基甲酰胺(Vilsmeier-Haak反应)或二氯甲基甲基醚(Friedel Crafts反应)时,在该卟啉的C-8未取代位