Anionic [4+2] cycloaddition strategy to linear furocoumarins: Synthesis of 8-methoxypsoralen and its isoster
作者:Dipakranjan Mal、Mousumi Bandhyopadhyay、K. Datta、Kadiyala V.S.N. Murty
DOI:10.1016/s0040-4020(98)00387-1
日期:1998.6
respectively in good yields (≥70%). Flash vacuum pyrolysis of O-methyl derivatives 9b and 21b at ∼ 500° C/. 1 mm provide furoindacenones 16b and 22b respectively, which in turn are convertible to furocoumarins 1 and 3.
亚砜酯14和20d在t BuOLi存在下成功地与双环烯酮8进行了环化,分别以良好的收率(≥70%)提供了五环酮9a和21a。O-甲基衍生物9b和21b在〜500℃/下的快速真空热解。1mm分别提供呋喃雌酮16b和22b,它们又可以转化为呋喃香豆素1和3。