Conversion of .beta.-amino esters to .beta.-lactams via tin(II) amides
摘要:
Addition of Sn[N(TMS)2]2 to beta-amino esters with sterically nondemanding substituents at C3 or on nitrogen gave beta-lactams in 76-100% yield. More sterically demanding beta-amino esters could be converted to beta-lactams in excellent yield using unsymmetrical tin(II) amide reagents which were prepared in situ. Optimal results for the in situ procedure involved addition of Sn[N(TMS)2]2 to a beta-amino ester, followed by addition of either pivalic acid or N-tert-butylacetamide.
alkyl radical generation and cyclization to prepare substituted indolines in a green, metal-free procedure. This method complements the Fischer indolization, metal-catalyzed couplings, and photocatalyzed radical addition and cyclization. A wide range of functional groups is tolerated, including aryl halides, that would not be compatible with most existing methods. Electronic bias and substitution were
very simple conjugate addition of aromatic and aliphatic amines to α,β-unsaturated carbonyl compounds under solvent-free conditions in the presence of catalytic amount of silicontetrachloride is reported. The reaction of aryl and alkyl amines with different Michael acceptors gave the corresponding Michael adducts with simple catalyst and good to excellent yields.
Conversion of .beta.-amino esters to .beta.-lactams via tin(II) amides
作者:Wei Bo Wang、Eric J. Roskamp
DOI:10.1021/ja00074a007
日期:1993.10
Addition of Sn[N(TMS)2]2 to beta-amino esters with sterically nondemanding substituents at C3 or on nitrogen gave beta-lactams in 76-100% yield. More sterically demanding beta-amino esters could be converted to beta-lactams in excellent yield using unsymmetrical tin(II) amide reagents which were prepared in situ. Optimal results for the in situ procedure involved addition of Sn[N(TMS)2]2 to a beta-amino ester, followed by addition of either pivalic acid or N-tert-butylacetamide.