Asymmetric Induction at C(?) and C(?) ofN-Enoylsultams by Organomagnesium 1,4-Addition/Enolate Trapping
作者:Wolfgang Oppolzer、Giovanni Poli、Arend J. Kingma、Christian Starkemann、G�rald Bernardinelli
DOI:10.1002/hlca.19870700825
日期:1987.12.16
The 1,4-addition of alkylmagnesium chlorides to conjugated N-enoylsultams and subsequent ‘enolate trapping’ with aq. NH4Cl or MeI/hexamethylphosphoric triamide generated centers of asymmetry at C(β) and/or at C(α) with good to excellent π-face defferentiation as demonstrated by the conversions 12, 14, and 89. This holds also for the regioselective 1,4-addition of EtMgC1 to a dienoylsultam (1516). Reactive