Asymmetric cyclization of meso-diepoxides using chiral (salen)Co(III)OAc catalyst forming optically active 1,4-anhydropentitols and 2,5-anhydrohexitols
                                
                                    
                                        作者:Masatoshi Kamada、Toshifumi Satoh、Toyoji Kakuchi、Kazuaki Yokota                                    
                                    
                                        DOI:10.1016/s0957-4166(99)00393-6
                                    
                                    
                                        日期:1999.9
                                    
                                    The asymmetric hydrations of meso-diepoxides, 1,2:4,5-dianhydro-3-0-methylxylitol 2, 1,2:5,6-dianhydro-3,4-di-O-methylallitol 3 and 1,2:5,6-dianhydro-3,4-di-O-methylgalactitol 4, were carried out using (R,R)-1 and (S,S)-1. An optically active five-membered cyclic compound was selectively produced in good yield from 2, but a mixture of the five- and six-membered cyclic compounds was obtained in the cases of 3 and 4. The ees of all cyclic products exceeded 90%. (C) 1999 Elsevier Science Ltd. All rights reserved.