Regioselective synthesis of pyrrolin-3-ones and 2,3,4,5-tetrahydro[1,3]-oxazines from N-vinylic amidines
作者:Francisco Palacios、Concepción Alonso、Gloria Rubiales、Maite Villegas
DOI:10.1016/j.tet.2008.12.014
日期:2009.2
Achiral and optically active N-vinylic amidines are obtained by simple addition of amidines to acetylenic esters. Thermal intramolecular cyclization of these substrates containing a carboxylate group in position 3 gives pyrrolin-3-ones. The enaminone character of these compounds towards propargyl bromide, diethyl azodicarboxylate, diethyl acetylenedicarboxylate, ethyl propiolate and phenyl isocyanate
非手性和旋光性N-乙烯基am是通过将idine简单地添加到炔属酯中而获得的。这些在位置3处含有羧酸根基团的底物的分子内热环化得到吡咯烷-3-酮。研究了这些化合物对炔丙基溴,偶氮二羧酸二乙酯,乙炔二羧酸二乙酯,丙酸乙酯和异氰酸苯酯的烯胺酮特性,得到官能化的吡咯啉-3-酮衍生物。酮戊二酸二乙酯制备的吡咯烷酮反应生成新的1,3-恶嗪衍生物。