An Efficient Highly Regioselective Synthesis of 2,3,4-Trisubstituted Pyrroles by Cycloaddition of Polarized Ketene <i>S</i>,<i>S-</i> and <i>N</i>,<i>S-</i>Acetals with Activated Methylene Isocyanides
作者:N. C. Misra、K. Panda、H. Ila、H. Junjappa
DOI:10.1021/jo062139j
日期:2007.2.1
An efficient route for regioselective synthesis of 2,3,4- substituted pyrroles allowing precise control over the introduction of a number of substituents and functionalities (tosyl, carbalkoxy, aryl, cyano, nitro, acetyl, benzoyl, cyclic amines, etc.) at the three positions of the pyrrole ring has been developed via 1,3-dipolar cycloaddition of readily accessible polarized ketene S,S- and N,S-acetals
区域选择性合成2,3,4-取代的吡咯的有效途径,可以精确控制在以下位置引入许多取代基和官能团(甲苯磺酰基,烷氧基,芳基,氰基,硝基,乙酰基,苯甲酰基,环胺等)吡咯环的三个位置是通过容易获得的极化烯酮S,S和N,S缩醛与衍生自活化亚甲基异氰酸酯的碳负离子的1,3-偶极环加成反应而形成的。