作者:James A. Marshall、Clark A. Sehon
DOI:10.1021/jo970360d
日期:1997.6.1
The total synthesis of 57, the enantiomer of the marine furanocembrane rubifolide (3), is described starting from (S)-(-)-perillyl alcohol (5). The successful route proceeded by oxidative cleavage of 5 to ester aldehyde 30 which was protected, reduced, and homologated to the acetylene 34, the left-hand segment of the synthetic target. Addition to the right-hand aldehyde 39 afforded alcohol 40. The carbonate
从(S)-(-)-紫苏醇(5)开始描述了海洋呋喃呋喃西林(3)的对映异构体57的总合成。成功的途径是将5氧化裂解为酯醛30,然后将其保护,还原并与合成靶标的左侧部分乙炔34同源。除右侧醛39外,得到醇40。将碳酸酯衍生物41转化为烯丙基锡烷醛44,其经BF(3).OEt(2)处理后环化。用Dess-Martin高碘烷试剂氧化,然后用Et(3)N处理,得到Allenone45。Allenone45在硅胶上催化的AgNO(3)存在下环化成呋喃46。短暂暴露于p-TsOH中可消除OMOM醚,得到非对映异构(Z)-乙烯基呋喃碳酸酯47和49。前者的皂化反应会生成酒精48,然后依次用(CF(3)CO)(2)O,然后Pd(PPh(3))(4)和CO在THF-H( 2)O,然后在硅胶上加AgNO(3)。在光谱比较的基础上,所得产物57与天然卢比佛利特相同。旋光度与天然材料的旋度相等且符号相反。还介绍了第二种方法,但未成功。