Reaction de l'acetylene dicarboxylate d'ethyle avec l'oxo-6 (2H) cyclohepta (c) pyrrole ; mecanismes de formation des adduits
作者:J. Duflos、G. Queguiner
DOI:10.1016/s0040-4020(01)96681-5
日期:1985.1
cycloaddition reactions of 6-oxo (2H) cyclohepta (c) pyrroles 4a, b and c with diethyl acetylene dicarboxylate an electron-deficient dienophile of relatively low LUMO energy level, afford the 1:2 adducts 5a, b1-b2 and c respectively The kinetics of the reactions, investigated By 1H NMR spectroscopy, have allowed to precise the mechanism of the addition In particular, new-intermediates, 1:2' adducts 6b and
6-氧代(2H)环庚(c)吡咯4a,b和c与乙二酸二乙酯的环加成反应使LUMO能量水平较低的缺电子双亲亲电子体,分别得到1:2加合物5a,b1-b2和c通过1 H NMR光谱研究的反应动力学使精确的加成机理成为可能。特别是,已观察到并分离了化合物6c的新中间体1:2'加合物6b和c。