Direct Amination of 1-Substituted 3,5-Dinitrobenzenes by 1,1,1-Trimethylhydrazinium Iodide
作者:Vladimir V. Rozhkov、Svyatoslav A. Shevelev、Ivan I. Chervin、Alexander R. Mitchell、Robert D. Schmidt
DOI:10.1021/jo005774c
日期:2003.3.1
The amination of 1-X-3,5-dinitrobenzenes via the vicarious nucleophilic substitution of hydrogen (VNS) with 1,1,1-trimethylhydrazinium iodide (TMHI) in the presence of t-BuOK or NaOMe in DMSO was studied. It was observed (when X = OMe, OCH2CF3, OCH2CF2CF2H, OPh) that the amination occurs regioselectively (ratio of ortho/pares-isomers is similar to9:1) and with high yield. For X = SPh or SCH2Ph, the reaction proceeded with a low yield (less than 20%), with a ratio of ortho/pares-isomers approximate to 1:1. For X = PhSO2 and 2 equiv of TMHI, a double amination occurs and 2,4-diamino-3,5dinitro-1-phenylsulfonylbenzene predominates in the mixture of isomers. Under the same conditions, 1,3,5-trinitrobenzene undergoes a double amination to yield 2,4diamino-1,3,5-trinitrobenzene. A proposed mechanism for this reaction is discussed.