Influence ofLewis Acids on the [4 + 2] Cycloaddition ofN,N?-Fumaroylbis[(2R)-bornane-10,2-sultam] to Cyclopentadiene and application to various dienes
作者:Tomasz Bauer、Christian Chapuis、Anna Kucharska、Piotr Rzepecki、Janusz Jurczak
DOI:10.1002/hlca.19980810213
日期:1998.2.4
Among seventeen different Lewis acids, TiCl4 was found to be the best catalyst for the [4 + 2] cycloaddition of cyclopentadiene to N,N′-fumaroylbis[(2R)-bornane-10,2-sultam] ((−)-1). Independently of the TiCl4 molar concentration, almost constant and complete (98–89% d.e.) diastereofacial π-selection was achieved in the Diels-Alder addition of (−)-1 to cyclopentadiene, cyclohexadiene, isoprene, and
在十七种不同的路易斯酸中,发现TiCl 4是将环戊二烯[4 + 2]环加成成N,N'-富马酰基双[(2 R)-硼烷-10,2-sultam]((-)的最佳催化剂- 1)。与TiCl 4摩尔浓度无关,在Diels - Alder向环戊二烯,环己二烯,异戊二烯和2,3-二甲基丁烯中添加(-)- 1的Diels - Alder中,获得了几乎恒定且完全的(98-89%de)非对映体π选择。-1,3-二烯。