4-phenyl-2-p-tolyl-5(4H)-oxazolone 在
Rose Bengal on Amberlite IRA-400 、 氧气 作用下,
以
苯 为溶剂,
反应 9.0h,
以12%的产率得到4,4'-bis<4-phenyl-2-p-tolyl-5(4H)-oxazolone>
参考文献:
名称:
Photochemical and Thermal Reactions of Heterocycles. IV. Phooto-oxidation Reactions of Mesoionic Dithioliumolate, Thiazoliumolate, and Related Heterocycles. Solvent Effects of the Course of the Photo-oxidation
5(4H)-Oxazolones 1 and munchnones 3 are reacted with triphenylvinylphosphonium bromide 2a to give, through a cycloaddition reaction, pyrrole derivatives 4a-d and 7a-c unsubstituted at C-3 and C-4. The use of substituted vinylphosphonium salts 2b,c and dipoles 1 and 3 allows the isolation of 3-methylpyrroles 4e,f and 7d,e and 3-pyrrolecarboxylic acids 9a-c, respectively. The cycloaddition reactions proceed with high regioselectivity because of the positive interaction of phosphonium group of 2 and carbonyl group of dipoles 1 and 3. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Photochemical and Thermal Reactions of Heterocycles. IV. Phooto-oxidation Reactions of Mesoionic Dithioliumolate, Thiazoliumolate, and Related Heterocycles. Solvent Effects of the Course of the Photo-oxidation