formation of alpha-methylene-beta-amino acid derivatives is achieved using the aza version of the Baylis-Hillman protocol. The products are readily formed in a three-component one-pot reaction between arylaldehydes, sulfonamides, and alpha,beta-unsaturated carbonyl compounds. The reaction is efficiently catalyzed by titanium isopropoxide and 2-hydroxyquinuclidine in the presence of molecular sieves. The
使用Baylis-Hillman协议的氮杂版本可直接形成α-亚甲基-β-
氨基酸衍
生物。在芳醛,磺酰胺和α,β-不饱和羰基化合物之间的三组分一锅反应中容易形成产物。在
分子筛的存在下,该反应被
异丙醇钛和2-羟基喹核啶有效地催化。该协议允许基质的结构变化,耐受贫电子和富电子芳基醛以及各种迈克尔受体。