The sydnone ring as an ortho-director of lithiation. 2.1 Dilithiation of 3-phenylsydnone and regiospecific -aryl acylation using N-methoxy-N-methylamides
作者:Kenneth Turnbull、Congcong Sun、Douglas M. Krein
DOI:10.1016/s0040-4039(98)00069-0
日期:1998.3
Readily available 3-phenylsydnone (1) reacts with n-butyllithium/TMEDA to form the dilithio species 2 which can be regiospecifically acylated at the ortho-aryl position using N-methoxy-N-methylamides (Weinreb's amides). (C) 1999 Elsevier Science Ltd. All rights reserved.
Sydnones as Masked Hydrazines for Heterocycle Formation: Reactions of 3-(2-substituted phenyl)sydnones with HCl
作者:Christopher R. Gelvin、Kenneth Turnbull
DOI:10.1002/hlca.19920750619
日期:1992.10.2
general, reaction of 3-(2-substituted phenyl)sydnones with HCl gives products derived from cleavage of the sydnone ring to the corresponding hydrazine and subsequent cyclization to the side chain. In one case, 3-(2-aminophenyl)sydnone (43), the product obtained, l-amino-lH-benzimidazole (47), apparently results from nucleophilic interception by the side chain prior to complete cleavage of the sydnone ring