描述了对映体纯的丙烯丙烯基酚的立体选择性双分子自由基偶联,其起始于阿魏酸的对映体纯的酰胺衍生物。后者由阿魏酸通过与(S)-丙氨酸或Oppolzer樟脑sultam反应制得。氧化步骤既可以通过酶促(HRP / H 2 O 2)进行,也可以通过化学方法(Ag 2 O)进行。在氧化步骤中观察到的对映选择性范围为65-84%,与在PM3浓度下对醌甲基化物中间体的构象分析相一致。
The first stereoselective free radical coupling of a phenylpropenoidic phenolic compound is reported. The oxidation of a chiral ferulic acid amide to give dimeric benzofuranic neolignan is performed enzymatically using horseradish peroxidase as the catalyst. Enantiomeric excess in a biologically active compound with phenylcoumaran skeleton (beta-5 dimer) is thus obtained. (C) 1998 Elsevier Science Ltd. Ail rights reserved.