Lewis Base Effects in the Baylis−Hillman Reaction of Arenecarbaldehydes and N-Arylidene-4-methylbenzenesulfonamides with α,β-Unsaturated Cyclic Ketones
作者:Min Shi、Yong-Mei Xu、Gui-Ling Zhao、Xiao-Feng Wu
DOI:10.1002/1099-0690(200211)2002:21<3666::aid-ejoc3666>3.0.co;2-9
日期:2002.11
and 2-cycloocten -1- one in methanol, products 10 - derived from Michael additions of methanol to 9-were formed as the major products, along with traces of 9. In general, the ring-size of the α,β-unsaturated cyclic ketone can significantly affect the reaction products and rates, the Baylis-Hillman reaction and the aldol condensation reaction taking place at the same time for 2-cyclohexen-1-one or 2-cyclohepten-1-one
在研究芳烃甲醛与 2-cyclohexen-1-one 或 2-cyclopenten-1-one 之间的 Baylis-Hillman 反应时,我们发现 te 反应非常复杂,因为路易斯碱、溶剂、底物和环- α,β-不饱和环酮的大小都会显着影响 Baylis-Hillman 反应速率甚至反应产物,特别是异常加合物 3 与正常的 Baylis-Hillman 加合物 2 在处理芳烃甲醛和 2 -cyclopenten-1-one 在 Baylis-Hillman 反应条件下,存在 Pbu^3 作为路易斯碱。另一方面,在 N-benzylidene-4-methylbenzosulfonamides 和 2-cyclohexen-1-one 或 2-cyclopenten-1-one 之间的 Baylis-Hillman 反应中,我们发现,在催化量的 DMAP 存在下,反应可以大大加速,导致正常的