Method for the preparation of chromanone 7
    6.
    发明授权
    Method for the preparation of chromanone 7 失效
    色酮的制备方法7

    公开(公告)号:US5847164A

    公开(公告)日:1998-12-08

    申请号:US925706

    申请日:1997-09-09

    摘要: A method of preparing (.+-.)-calanolide A, 1, a potent HIV reverse transcriptase inhibitor, from chromene 4 is provided. Useful intermediates for preparing (.+-.)-calanolide A and its derivatives are also provided. According to the disclosed method, chromene 4 intermediate was reacted with acetaldehyde diethyl acetal or paraldehyde in the presence of an acid catalyst with heating, or a two-step reaction including an aldol reaction with acetaldehyde and cyclization either under acidic conditions or neutral Mitsunobu conditions, to produce chromanone 7. Reduction of chromanone 7 with sodium borohydride, in the presence of cerium trichloride, produced (.+-.)-calanolide A. A method for resolving (.+-.)-calanolide A into its optically active forms by a chiral HPLC system or by enzymatic acylation and hydrolysis is also disclosed. Finally, a method for treating or preventing viral infections using (.+-.)-calanolide A or (-)-calanolide A is provided.

    摘要翻译: 提供了从色烯4制备(+/-) - 丙内酰脲A,1,一种有效的HIV逆转录酶抑制剂的方法。 还提供了制备(+/-) - 丙内酰脲A及其衍生物的有用中间体。 根据所公开的方法,在酸催化剂的存在下,将色烯4中间体与乙醛二乙基缩醛或对甲醛反应,或者在酸性条件或中性Mitsunobu条件下,包括醛醇与乙醛反应和醛化反应的两步反应, 产生苯并二氢吡喃酮7.在三氯化铈的存在下,用硼氢化钠还原色酮7.产生(+/-) - 甘露糖苷A。一种通过手性拆分(+/-) - 卡立拉内酯A至其光学活性形式的方法 还公开了HPLC系统或通过酶酰化和水解。 最后,提供了一种使用(+/-) - 蒎烯内酰胺A或( - ) - cal醇酯A治疗或预防病毒感染的方法。