New chiral recognition of chiral tin(II) enolates toward cyclic acyl iminium species. Asymmetric total synthesis of (−)-supinidine
作者:Yoshimitsu Nagao、Dal Wei-Min、Ochiai Masahito
DOI:10.1016/s0040-4039(00)82286-8
日期:——
Diastereoselective alkylation of chiral tin(II) enolates onto cyclic acyl iminium ion proceeded in a different chiral recognition mode from the case of onto the cyclic acyl imines . This new diastereoselective alkylation was efficiently utilized for an asymmetric totalsynthesis of (−)-supinidine ().
Enantioselective, Thiourea-Catalyzed Intermolecular Addition of Indoles to Cyclic N-Acyl Iminium Ions
作者:Emily A. Peterson、Eric N. Jacobsen
DOI:10.1002/anie.200902420
日期:——
Fair game for indoles, N‐acyl iminiumion intermediates underwent intermolecularaddition by these nucleophiles under the catalysis of a chiral thiourea Schiff base derivative. A variety of functionalized indole frameworks were assembled with high enantioselectivity from simple precursors by this method (see scheme; TMS=trimethylsilyl; R=H, Me, vinyl, OMe, F, Cl, Br; R1=benzyl, methyl; n=1,2).