Jiang N, Ma Z, Qu Z, Xing X, Xie L, Wang J. Investigation of the transition-metal- and acid-catalyzed reactions of beta-(N-tosyl)amino diazo carbonyl compounds.
J Org Chem 2003;
68:893-900. [PMID:
12558413 DOI:
10.1021/jo0259818]
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Abstract
A series of beta-(N-tosyl)amino diazo carbonyl compounds have been prepared by nucleophilic condensation of N-tosylimines with acyldiazomethanes. The diazo decomposition of these diazo carbonyl compounds under various catalytic conditions, including Rh(II) carboxylates, Cu(I) and Cu(II) complexes, PhCO(2)Ag/Et(3)N, TsOH, and SnCl(2).2H(2)O, has been investigated. It was found that, in most cases, the diazo decomposition gave preferentially 1,2-aryl migration product, but 1,2-hydride migration predominated when PhCO(2)Ag/Et(3)N was the catalytic system. Hammett correlation has been applied in the analysis of the electronic effects of 1,2-aryl migration. The factors that govern the migratory preference and the mechanistic aspects of the reaction are discussed.
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