Tandem Reduction−Chloroallylboration of Esters: Asymmetric Synthesis of Lamoxirene, the Spermatozoid Releasing and Attracting Pheromone of the Laminariales (Phaeophyceae)
作者:Christian Hertweck、Wilhelm Boland
DOI:10.1021/jo991629r
日期:2000.4.1
The asymmetric synthesis of all four stereoisomers of lamoxirene (cis-2-cyclohepta-2,5-dienyl-3-vinyloxirane), the spermatozoid-releasing and -attracting pheromone of the Laminariales (Phaeophyceae), is reported. Chiral ethyl cyclohepta-2,5-diene carboxylates, prepared by a divinylcyclopropane Cope rearrangement, were effectively alkylated by means of a novel tandem DIBAL-H reduction/asymmetric al
据报道,拉莫西林的全部四个立体异构体(顺式-2-环庚基-2,5-二烯基-3-乙烯基环氧乙烷),海带(精科)的精子释放和吸引信息素的不对称合成。通过二乙烯基环丙烷Cope重排制备的手性乙基环庚-2,5-二烯羧酸酯通过新颖的串联DIBAL-H还原/不对称α-氯烯丙基化反应使用(Z)-γ-氯代烯丙基op基樟脑基硼烷有效地烷基化。随后的顺-α-氯醇用DBU转化为相应的乙烯基环氧乙烷,从而以良好的化学性质和优异的光学收率(90-97%ee)提供了信息素的所有四个异构体。精子释放试验使用的是同生生长的物种指状芽孢杆菌,hyperborea和L. saccharina,并建立了(1'S,2R,