A new preparation of δ-lactams is reported. In the presence of a Lewis acid promoter, alkoxyisocoumarins engage a range of N-aryl and N-alkyl imines to form δ-lactams with a pendent carboalkoxy substituent. A sulfonamide-thiourea catalyst enables the synthesis of these products in moderate to good enantioselectivities.
报道了δ-内酰胺的新制备方法。在
路易斯酸促进剂的存在下,烷氧基异
香豆素与一定范围的N-芳基和N-烷基
亚胺结合,形成带有侧链烷氧基取代基的δ-内酰胺。磺酰胺-
硫脲催化剂能够以中等至良好的对映选择性合成这些产物。