Acylation of Sydnones with Acetic Anhydride in the Presence of Montmorillonite K-10
作者:Kenneth Turnbull、Jones C. George
DOI:10.1080/00397919608004593
日期:1996.7
Abstract Various 4-acetyl sydnones 2 can be prepared in good yield by reaction of the corresponding 3-arylsydnones (cf. 1) with acetic anhydride at ∼ 110°C catalyzed by Montmorillonite K-10. The reaction fails where an ortho-keto moiety is present; therein sydnone ring cleavage occurs to form the corresponding indazole 3.
<i>ortho</i>-(Substituted Silyl)phenylsydnones via a Novel Sydnone to Phenyl Ring, Lithiation-Induced Silicon Migration
作者:Kenneth Turnbull、Douglas M. Krein
DOI:10.1081/scc-120021032
日期:2003.7
Abstract 3-(2-Bromophenyl)sydnone (5) reacts with LDA then substituted chlorosilanes to form the corresponding 4-silylsydnones 6, which rearrange to the novel ortho-silylphenylsydnones 8 on treatment with n-butyllithium.
The Efficient Synthesis of 3-Arylsydnones Under Neutral Conditions
作者:Jacqueline Applegate、Kenneth Turnbull
DOI:10.1055/s-1988-27791
日期:——
Various substituted aryl sydnones can be prepared in high yield under mild, neutral conditions by nitrosation of the appropriate aryl glycine with isoamyl nitrite in dimethoxyethane followed by cyclization with trifluoroacetic anhydride.
Formation of 4-Hydroxy-4-Substituted Sydno[3,4-a](4H)indoles via Dilithiation of 3-(2-Bromophenyl)sydnone
作者:Kenneth Turnbull、Douglas M. Krein
DOI:10.1055/s-1996-4373
日期:1996.10
Novel fused-ring sydnoindoles (cf.5) have been prepared, generally in excellent yield, by dilithiation of 3-(2-bromophenyl)sydnone (3) and subsequent reaction with esters.