Double C–N bond cleavages of <i>N</i>-alkyl 4-oxopiperidinium salts: access to unsymmetrical tertiary sulfonamides
作者:Ying Fu、Ming-Peng Li、Chun-Zhao Shi、Fang-Rong Li、Zhengyin Du、Congde Huo
DOI:10.1039/c9ob02107h
日期:——
paper, regiospecific, double intraannular C–N bond cleavages of N-alkyl 4-oxopiperidinium salts are presented. The reaction sequence involves a charge-transfer complex, in situ formed between sulfonyl chloride and N-methylmorpholine, which induces S–Cl bond homolysis of sulfonyl chloride, yielding a reactive sulfonyl radical that further induces the double C–N bond cleavages of N-alkyl 4-oxopiperidinium
A new and convenient method for the construction of sulfonamides via a copper-catalyzed oxidative coupling between sodium sulfinates and amines with 1 atm O2 or DMSO as the oxidant was described. This method provides efficient and robust synthesis of functional sulfonamides in good yields and excellent chemoselectivity. And detailed mechanistic studies showed that this transformation may go through a single electron transfer (SET) pathway.
Direct Sulfonamidation of Primary and Secondary Benzylic Alcohols Catalyzed by a Boronic Acid/Oxalic Acid System
作者:Tristan Verdelet、Robert M. Ward、Dennis G. Hall
DOI:10.1002/ejoc.201700621
日期:2017.10.17
sulfonamidation of primary and secondary benzylic aclohols catalyzed by a 1,2,3,4-tetrafluorophenylboronic acid/oxalic acid co-catalytic system has been examined. The reaction proceeds in mild conditions with readily available starting materials and has been shown to be gram-scalable without significant decrease of yield. Both primary and secondary benzylic alcohols were evaluated and afforded the
Copper-Catalyzed Amination of Primary Benzylic C−H Bonds with Primary and Secondary Sulfonamides
作者:David A. Powell、Hope Fan
DOI:10.1021/jo100197r
日期:2010.4.16
A room-temperature, copper-catalyzed amination of primary benzylic C-H bonds with primary and secondary sulfonamides is described. The reaction is applicable to the coupling of a range of primary and secondary benzylic hydrocarbons with a diverse set of sulfonamides and is tolerant of substitution on both coupling partners. Factors which influence the selectivity of C-H functionalization between primary and secondary sites are examined.