A New Method for the Construction of Indole Nucleus
摘要:
Directed lithiation of N-tert-butoxycarbonylanilines and subsequent reaction with 1-tert-butyldimethylsilyl-1-phenylsulfinylethene gave the conjugate addition products which, without isolation, were cyclized to 1-tert-butoxycarbonyl-2-phenylthioindolines under thermal sila-Pummerer reaction conditions.
Reaction of organolithiums with a 1-(trimethylsilyl)ethenyl sulfide produces 1,2-bis(trimethylsilyl)cyclopropanes, while use of 1-silylethenyl sulfides bearing a bulkier silyl moiety results in exclusive formation of the corresponding Michael adduct anions which are then quenched with aldehydes to give vinyl sulfides. On the contrary, a 1-(trimethylsilyl)ethenyl sulfoxide undergoes smooth Michael addition with a variety of organo-metallics and the resulting carbanion intermediates can be quenched with aldehydes to produce vinyl sulfoxides. Scope and limitations of these sequential reactions are discussed.
A New Method for the Construction of Indole Nucleus
作者:Masatomo Iwao
DOI:10.3987/com-93-6563
日期:——
Directed lithiation of N-tert-butoxycarbonylanilines and subsequent reaction with 1-tert-butyldimethylsilyl-1-phenylsulfinylethene gave the conjugate addition products which, without isolation, were cyclized to 1-tert-butoxycarbonyl-2-phenylthioindolines under thermal sila-Pummerer reaction conditions.
A highly stereoselective synthesis of (z)-1-phenylthio-1-trialkyl- silylalkenes from 1-methoxy-1-phenylthio-1-trialkylsilylalkanes
A new method for the highlystereoselectivesynthesis of (Z) -1-phenylthio-1-trialkylsilylalkenes 3 by the elimination of methanol from 1-methoxy-1-phenylthio-1-trialkylsilylalkane 2 in organic solvents is described.