Do oxazoliks undergo Diels-Alder reactions with heterodienophiles?
作者:Alfred Hassner、Bilha Fischer
DOI:10.1016/s0040-4020(01)81032-2
日期:1989.1
5-Alkoxy and 2-alkoxyoxazoles were shown to react with NN, CN or CO dienophiles to form products that in most cases can be explained to result from a Diels-Alder addition, or by nucleophilic attack of the oxazole on the dienophile, followed by rearrangement. The products are triazolines, imidazolines or oxazolines respectively. Relative reactivitles were established and mechanistic pathways discussed
Photochemical synthesis of 1,2,4-triazoles <i>via</i> addition reaction of triplet intermediates to diazoalkanes and azomethine ylide intermediates
作者:Bao-Gui Cai、Ye-Peng Bao、Chao Pei、Qian Li、Lei Li、Rene M. Koenigs、Jun Xuan
DOI:10.1039/d2sc04720a
日期:——
addition reaction with diazoalkanes and formation of an azomethine ylide followed by dipolar cycloaddition reaction with organic nitriles to give a 1,2,4-triazole. The application of this transformation was elaborated in a broad and general substrate scope (48 examples), including scale-up via flow chemistry and downstream transformations. Experimental and computationalstudies were performed to elucidate