Simple Efficient Synthesis of Pyranoquinoline Alkaloids: Flindersine, Khaplofoline, Haplamine and their Analogues
作者:Dhanabal Thangavel、Sangeetha Ravindran、Gengan Robert Moonsamy、Mohan Subramaniam Palathurai
DOI:10.3184/030823407x191859
日期:2007.2
An efficient two step synthesis of pyranoquinoline alkaloids is described. Direct treatment of isoprene with 4-hydroxyquinolin-2(1H)-one in the presence of polyphosphoric acid furnished dihydroflindersine in good yield, and which on dehydrogenation led to a new synthesis of flindersine. Khaplofoline, a linear pyranoquinoline alkaloid, was obtained as a minor product. The syntheses of derivatives are
描述了吡喃喹啉生物碱的有效两步合成。在多磷酸的存在下,用 4-羟基喹啉-2(1H)-one 直接处理异戊二烯以良好的收率提供二氢氟苯磺辛,脱氢导致氟苯辛的新合成。Khapfoline 是一种线性吡喃喹啉生物碱,作为次要产物获得。还记录了衍生物的合成。