Highly enantio- and diastereoselective boron aldol reactions of α-heterosubstituted thioacetates with aldehydes and silyl imines
作者:Cesare Gennari、Anna Vulpetti、Gilles Pain
DOI:10.1016/s0040-4020(97)00251-2
日期:1997.4
Boron enolates derived from α-heterosubstituted thioacetates and bearing menthone-derived chiral ligands react with aldehydes to give anti aldols with excellent diastero- and enantiocontrol. Boron enolates derived from tert-butyl α-halothioacetate and bearing menthone-derived chiral ligands react with imines with excellent diastero- and enantiocontrol to give syn α-halo-β-aminothioesters, which can
Boron aldol reaction of α-halosubstitued thioacetates with silyl imines: A highly enantio- and diastereoselective synthesis of aziridines
作者:Cesare Gennari、Gilles Pain
DOI:10.1016/0040-4039(96)00637-5
日期:1996.5
Boron enolates derived from tert-butyl α-halothioacetate and bearing menthone-derived chiral ligands react with imines with excellent diastero- and enantiocontrol to give syn α-halo-β-aminothioesters, which can be converted to the corresponding aziridines by simple ring closure during LAH reduction. A key precursor of antibiotics (+)-thiamphenicol and (−)-florfenicol was synthesized.