An efficient approach to the diastereoselective synthesis of benzylidene-, benzyl-pyrrolizidinones, and pyrrolizidines is described. The sequence is based on a highly stereoselective Heck reaction between a hydroxylated pyrrolizidinone, prepared from a Morita-Baylis-Hillman adduct, and a suitable aryl halide, using Nájera’s oxime derived palladacycle as catalyst.
本文介绍了一种非对映选择性合成亚苄基、苄基
吡咯烷酮和
吡咯烷类化合物的有效方法。该步骤基于由 Morita-Baylis-Hillman 加合物制备的
羟基吡咯烷酮与合适的芳基卤化物之间的高立体选择性 Heck 反应,并使用 Nájera 的
肟衍生帕拉代环作为催化剂。