Highly diastereoselective intramolecular Diels–Alder reaction of chiral silatrienes
作者:Paulo J Coelho、Luis Blanco
DOI:10.1016/s0040-4020(03)00261-8
日期:2003.3
2-silahexa-3,5-dienyl acrylates were prepared in six steps from dichloro(chloromethyl)methylsilane. The EtAlCl2 catalysed intramolecular Diels–Alder reaction of these compounds gave chiral 4-sila-4a,7,8,8a-tetrahydroisochroman-1-ones in good yield. Very good diastereoselectivity was observed for a silatriene bearing a methyl and a 2-methoxyphenyl substituent on the chiral silicon atom.
由六氯(氯甲基)甲基硅烷分六步制备新的硅手性2-硅六氟-3,5-二烯基丙烯酸酯。这些化合物的EtAlCl 2催化的分子内Diels-Alder反应得到高收率的手性4-sila-4a,7,8,8a-四氢异色满-1-酮。对于在手性硅原子上带有甲基和2-甲氧基苯基取代基的硅三烯,观察到非常好的非对映选择性。