Porphyrins with exocyclic rings. Part 24. Synthesis and spectroscopic properties of pyrenoporphyrins, potential building blocks for porphyrin molecular wires
作者:Virajkumar Gandhi、Michelle L. Thompson、Timothy D. Lash
DOI:10.1016/j.tet.2010.01.046
日期:2010.3
Porphyrins with fused pyrene units have been prepared by ‘2+2’ and ‘3+1’ methodologies. Nitration of 1,2,3,6,7,8-tetrahydropyrene, followed by oxidation with DDQ, gave 4-nitropyrene and this condensed with ethyl isocyanoacetate in the presence of DBU or a phosphazene base to generate a pyrenopyrrole ethyl ester. Ester saponification and decarboxylation with KOH in ethylene glycol at 190 °C gave the
具有稠合pyr单元的卟啉已通过“ 2 + 2”和“ 3 + 1”方法制备。硝化1,2,3,6,7,8-四氢py,然后用DDQ氧化,得到4-硝基py,在DBU或磷腈碱存在下,将其与异氰基乙酸乙酯缩合,生成吡咯并吡咯乙酯。在190°C下用乙二醇在KOH中进行酯化和脱羧,得到母体吡啶并[4,5- c ]吡咯,并进一步与2当量的乙酰氧基甲基吡咯缩合,得到相应的三吡喃并在叔端被保护。丁酯。在一锅法中,用TFA裂解酯保护基,然后用二氯甲烷稀释,用吡咯二醛'3 + 1'缩合,再用DDQ脱氢,生成的目标卟啉卟啉具有良好的总收率。还从pyrenopyrrole中间体制备的二醛和此反应得到的OPP -dipyrenoporphyrin。吡咯并吡咯乙酯在酸催化剂的存在下与二甲氧基甲烷反应生成二戊基吡咯烷基甲烷,并用于制备adj-使用麦当劳“ 2 + 2”方法提取双肾上腺素。吡咯并吡咯二醛还用于制备具有稠合的an