The strong base-induced cycloaddition of 6-ethynyl-6-hydroxy-5,6,7,8-tetrahydrohomophthalic anhydride (10) to 5,8-dihydro-5,8-dioxoquinoline (11) constitutes a regiospecific and efficient route to the D-ring pyridine analogue (5) of 11 -deoxydau nomycin (2a).
强碱诱导的6-
乙炔基-6-羟基-5,6,7,8-四氢
邻苯二甲酸酐(10)与5,8-二氢-5,8-二氧
喹啉(11)的环加成反应形成了一种区域特异性且高效的途径11-脱氧
道诺霉素(2a)的D-环
吡啶类似物(5)。