Sydnone Ring as an ortho-Director of Lithiation, 3: One-Pot Regiospecific o-Acylation and Subsequent Sydnone 4-Substitution
摘要:
Readily available 3-phenylsydnone (1) reacts with n-butyllithium/N,N,N',N'-tetramethylethylenediamine (TMEDA) to form the dilithio species 2, which can be acylated regiospecifically at the ortho-aryl position using N-methoxy-N-methylamides (Weinreb's amides) followed by reaction with a second, more reactive electrophile at the sydnone C-4 position. Asymmetrically substituted arylsydnones 7 are obtained in 57-86% yield.
Sydnone Ring as an <i>ortho</i>-Director of Lithiation, 3: One-Pot Regiospecific <i>o</i>-Acylation and Subsequent Sydnone 4-Substitution
作者:Kenneth Turnbull、Douglas M. Krein
DOI:10.1080/00397910802664251
日期:2009.7.21
Readily available 3-phenylsydnone (1) reacts with n-butyllithium/N,N,N',N'-tetramethylethylenediamine (TMEDA) to form the dilithio species 2, which can be acylated regiospecifically at the ortho-aryl position using N-methoxy-N-methylamides (Weinreb's amides) followed by reaction with a second, more reactive electrophile at the sydnone C-4 position. Asymmetrically substituted arylsydnones 7 are obtained in 57-86% yield.