文献类型：期刊文献

英文题名：Synthesis of Various Saturated and Unsaturated N-Heterocyclic Carbene Precursors by Triflic Anhydride Mediated Intramolecular Cyclization

作者：Zhang, Jun[1,2];Fu, Jun[1,2];Su, Xiaolong[1,2];Wang, Xiao[1,2];Song, Shangfei[1,2];Shi, Min[1,2,3]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Organometall Chem, Shanghai 200032, Peoples R China

年份：2013

卷号：8

期号：3

起止页码：552

外文期刊名：CHEMISTRY-AN ASIAN JOURNAL

收录：;EI(收录号：20130916069097);WOS:【SCI-EXPANDED(收录号:WOS:000315333200006)】；

基金：Financial support from the Shanghai Pujiang Talent Program (11J1402500), the Fundamental Research Funds for the Central Universities (WK1114014), the Shanghai Municipal Committee of Science and Technology (11JC1402600), the National Basic Research Program of China (973)-2010CB833302, as well as the National Natural Science Foundation of China (21171056, 21072206, 20472096, 20872162, 20672127, 21121062, and 20732008) is gratefully acknowledged.

语种：英文

外文关键词：carbenes; cyclization; nitrogen heterocycles; oxygen heterocycles

摘要：Closing the circle: A versatile and modular method yields various saturated and unsaturated N-heterocyclic carbene precursors from a Tf2O- mediated intramolecular cyclization reaction. A resultant sterically demanding oxazolium salt could be used not only as good intermediate for directly preparing N,N'-disubstituted imidazolium salts in one step, but also as a precursor of sterically demanding oxazol-2-ylidene. Copyright ? 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.