作者:Nobuo Itoh、Shigehiko Sugasawa
DOI:10.1016/0040-4020(59)80030-2
日期:1959.1
Ethylene ketals of the type (I) cyclise in presence of phosphorus pentoxide in pyridine to give the ketal (II) which on hydrolysis yields 1-phenyl-6:7-dimethoxy-4-oxo-3:4-dihydroisoquinoline (III). 1-(4-oxo-cyclohexyl)-6:7-dimethoxy-3:4-dihydroisoquinoline (VIII) and 2-oxo-3-methyl-9:10-dimethoxy-1:2:3:4:6:7-hexahydro-11bH-benzo[a]-quinolizine (XV) were also synthesised.
(I)型乙烯缩酮在吡啶中有五氧化二磷存在下环化生成缩酮(II),该缩酮在水解后产生1-苯基-6:7-二甲氧基-4-氧代-3:4-二氢异喹啉(III) )。1-(4-氧代-环己基)-6:7-二甲氧基-3:4-二氢异喹啉(VIII)和2-氧代-3-甲基-9:10-二甲氧基-1:2:3:4:还合成了6:7-六氢-11bH-苯并[a]-喹啉(XV)。