Synthesis of the Oxepinochromone Natural Products Ptaeroxylin (Desoxykarenin), Ptaeroxylinol, and Eranthin
作者:Marjorie Bruder、Paul L. Haseler、Marina Muscarella、William Lewis、Christopher J. Moody
DOI:10.1021/jo902117e
日期:2010.1.15
7-hydroxyl group, allylation of the 5-hydroxyl, followed by Claisen rearrangement under microwave conditions with concomitant deprotection of the 7-hydroxyl. Alkylation of the 7-hydroxyl with the appropriate allyl bromide provides a precursor for ring-closing metathesis to deliver the oxepinochromone ring system. Eranthin was obtained by a similar strategy involving Claisen rearrangement to transfer
据报道,氧代庚并二氢吡喃苯丙酸的合成得到了改善,同时还合成了相关的天然产物戊苯二酚和卵黄质。通过7-羟基的选择性反应,5-羟基的烯丙基化,随后在微波条件下的克莱森重排以及7-羟基的脱保护的情况下,从色酮降冰片苷原中获得了Pereroxylin和Ptaeroxylinol。7-羟基与适当的烯丙基溴的烷基化提供了用于闭环复分解以递送氧代庚并色酮环系统的前体。通过涉及克莱森重排以将烯丙基从降钙素原的C-7羟基选择性地转移至C-8的类似策略获得了Eranthin。