Unprecedented observation of sulfonamides in the transesterification of N-unsubstituted carbamates with sulfonyl chlorides
摘要:
Sulfonamides have been identified as by-products in the base-mediated transesterification of N-unsubstituted carbamates with sulfonyl chlorides to give the corresponding sulfonates. A proposed mechanism and the synthesis of hindered 2,6-disubstituted arylsulfonates via this method are also reported. (C) 2003 Elsevier Ltd. All rights reserved.
Aryl and heteroaryl nosylates as stable and cheap partners for Suzuki–Miyaura cross-coupling reactions
作者:Anna Dikova、Nicolas P. Cheval、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1016/j.tet.2016.02.061
日期:2016.4
Aryl and heteroaryl para-nitrophenylsulfonates (nosylates) have been successfully engaged for the first time in Suzuki–Miyauracross-couplingreactions with various aryl or vinylboronic acids (48–98%, 12 examples). The best catalyst/ligand combination have been determined to be 2 mol % of palladium acetate (Pd(OAc)2) and 4 mol % of 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl (XPhos) using