作者:Agnès Pommier、Viatcheslav Stepanenko、Krzysztof Jarowicki、Philip J. Kocienski
DOI:10.1021/jo0268097
日期:2003.5.1
(+)-(4R)-manoalide is reported in which all 25 carbons of the sesterterpenoid skeleton are constructed from 3-furaldehyde, trimethylalane, oxirane, CO, beta-ionone, and propargyl bromide. The overall yield for the longest linear sequence (12 steps) is 12%. Key steps include (a) a zirconium-catalyzed carboalumination reaction to construct the C10-C11 trisubstituted alkene, (b) a Cu(I)-mediated 1,2-metalate rearrangement
对映体合成的磷脂酶A(2)抑制剂(+)-(4R)-马来酰内酯,其中酯类萜骨架的所有25个碳原子均由3-呋喃醛,三甲基铝烷,环氧乙烷,CO,β-紫罗兰酮和炔丙基构成溴化物。最长的线性序列(12个步骤)的总产率为12%。关键步骤包括(a)锆催化的碳铝化反应以构建C10-C11三取代的烯烃,(b)Cu(I)介导的1,2-金属盐重排以构建C6-C7三取代的烯烃,(c)a锐利的动力学拆分,可确保(4R)-立体化学,(d)通过Mo催化的高炔丙醇的环异构化反应生成5-stannyl-2,3-dihydrofuran,以及(e)通过光氧化α-羟基呋喃酮环来构建羟基呋喃酮环甲硅烷基呋喃。