Enantioselective cyanoformylation of aldehydes mediated by BINOLAM–AlCl as a monometallic bifunctional catalyst
作者:Jesús Casas、Alejandro Baeza、José M. Sansano、Carmen Nájera、José M. Saá
DOI:10.1016/s0957-4166(02)00824-8
日期:2003.1
BINOLAM–AlCl's, binaphthoxide aluminium chloride species generated in situ from either (R)- or (S)-3,3′-bis(diethylaminomethyl)-2,2′-dihydroxy-1,1′-binaphthalene (BINOLAM) behave as Lewis acid–Lewis base (LA-LB) catalysts in the enantioselective addition of methyl cyanoformate to aldehydes at room temperature, thereby leading to the asymmetric synthesis of (S)- or (R)-O-methoxycarbonyl cyanohydrins
Enantioselective Synthesis ofO-Methoxycarbonyl Cyanohydrins: Chiral Building Blocks Generated by Bifunctional Catalysis with BINOLAM-AlCl
作者:Alejandro Baeza、Jesús Casas、Carmen Nájera、José M. Sansano、José M. Saá
DOI:10.1002/ejoc.200500939
日期:2006.4
catalysts in promoting the enantioselective cyanoalkoxycarbonylation of aldehydes. The reaction is wide in scope and the mechanistic evidence gathered suggests the intervention of an indirect process involving enantioselective hydrocyanation by HCN, followed by O-alkoxycarbonylation. The resultant O-alkoxycarbonyl cyanohydrins are shown to be important chiral building blocks for synthesis. Chemoselective hydrolysis