The optically active plant product homaline (6) has been synthesized in a convergent sequence starting with β-phenyl-β-alanine and putrescine (14) The key transformation in this sequence is the ring expansion by transamidation of a functionalized chiral β-lactam precursor
旋光性植物产品荷马琳(6)已从β-
苯基-
β-丙氨酸和
腐胺(14)开始,以收敛的顺序合成。该序列的关键转化是通过功能化的手性β-内
酰胺前体的转
酰胺作用进行的扩环