The influence of catalysts, acid chlorides, and solvents on the acylation of methyl 2-methyl-4H-thieno[3,2-b]pyrrole-5-carboxylate was studied. The use of AlCl3 allows the regioselective introduction of the acyl group into position 3 to be performed, whereas the acyl group is regioselectively introduced into position 6 of thienopyrrole when SnCl4 is used.
The influence of catalysts, acid chlorides, and solvents on the acylation of methyl 2-methyl-4H-thieno[3,2-b]pyrrole-5-carboxylate was studied. The use of AlCl3 allows the regioselective introduction of the acyl group into position 3 to be performed, whereas the acyl group is regioselectively introduced into position 6 of thienopyrrole when SnCl4 is used.
Synthesis of Photochromic 1,2-Dihetarylethene Using Regioselective Acylation of Thienopyrroles
作者:Michael M. Krayushkin、Vladimir N. Yarovenko、Stanislav L. Semenov、Igor V. Zavarzin、Anatoliy V. Ignatenko、Andrey Yu. Martynkin、Boris M. Uzhinov
DOI:10.1021/ol026705i
日期:2002.10.1
[GRAPHICS]The influence of catalysts, acid chlorides, and solvents in the acylation of methyl 2-methyl-4H-thieno[3,2-b]pyrrole-5-carboxylate was studied. Conditions for the regioselective acylation processes were found. Thienopyrrole-based photochrome was synthesized for the first time.