Investigation of Streamlined Syntheses of Porphyrins Bearing Distinct Meso Substituents
作者:Syeda Huma H. Zaidi、Rosario M. Fico、Jonathan S. Lindsey
DOI:10.1021/op050193g
日期:2006.1.1
concentrations. Thirty-one acids (plus additives) have been examined for reactions at 25 mM reactants using the synthesis of a trans-A2B2-porphyrin as a model. The porphyrin was formed in ∼20% yield upon condensation in CH2Cl2 at room temperature using (1) Sc(OTf)3 (3.2 mM) + 2,6-di-tert-butylpyridine (32 mM), or (2) Zn(OTf)2 (10 mM). Nine porphyrins were prepared in this manner in yields of 15−22% with
在基础研究和各种应用中使用卟啉需要容易地获得大量纯净形式的物质。二吡咯甲烷加二吡咯甲烷-二甲醇的缩合反应的现有条件使用2.5 mM反应物,收率约为30%,没有可检测到的加扰现象。大规模合成需要在较高浓度下起作用的缩合和氧化条件。使用反式-A 2 B 2-卟啉的合成作为模型,已经检查了31种酸(加上添加剂)在25 mM反应物上的反应。在室温下使用(1)Sc(OTf)3在CH 2 Cl 2中缩合后形成卟啉,产率约为20%。(3.2 mM)+ 2,6-二叔丁基吡啶(32 mM)或(2)Zn(OTf)2(10 mM)。以这种方式制备了九种卟啉,收率为15-22%,没有可检出的加扰,而其他三种卟啉的加扰水平较低和/或产率较低(8-14%)。还研究了氧化条件。5-甲苯乙烯基吡咯甲烷与1-(4-甲氧基苯甲酰基)-9-(4-甲基苯甲酰基)-5-苯基二吡咯甲烷(在720 mL CH 2 Cl 2中分别为18
Rational Syntheses of Porphyrins Bearing up to Four Different Meso Substituents
作者:Polisetti Dharma Rao、Savithri Dhanalekshmi、Benjamin J. Littler、Jonathan S. Lindsey
DOI:10.1021/jo000882k
日期:2000.11.1
using EtMgBr and an acid chloride has been refined. A new procedure for the preparation of unsymmetrical diacyl dipyrromethanes has been developed that involves (1) monoacylation with EtMgBr and a pyridyl benzothioate followed by (2) introduction of the second acyl unit upon reaction with EtMgBr and an acid chloride. The scope of these acylation methods has been examined by preparing multigram quantities