作者:K. C. Nicolaou、David Sarlah、T. Robert Wu、Weiqiang Zhan
DOI:10.1002/anie.200903382
日期:2009.9
Cascading reactions, including the conversion of a TMS‐epoxy tetraene 1 into the hirsutellone tricyclic core 2, feature heavily in the first totalsynthesis of the antituberculosis fungal metabolite hirsutelloneB. TMS=trimethylsilyl, LA=Lewis acid.
级联反应,包括将 TMS-环氧四烯1转化为 hirsutellone 三环核心2,在抗结核真菌代谢物 hirsutellone B 的首次全合成中占有重要地位。 TMS=三甲基甲硅烷基,LA=路易斯酸。
Facial-Selective Allylation of Methyl Ketones for the Asymmetric Synthesis ofα-Substituted Tertiary Homoallylic Ethers
作者:Lutz F Tietze、Ludwig Völkel、Christian Wulff、Berthold Weigand、Christian Bittner、Paul McGrath、Keyji Johnson、Martina Schäfer
The asymmetric synthesis of enantiomerically pure a-substituted tertiary homoallylic ethers 4a, 11 and 12a-c by the allylation of ethyl methyl ketone (la) with gamma-substituted allylsilanes 9a-h is described. The allylsilanes were obtained by a nickel-catalysed Grignard cross-coupling reaction of (E)- and (Z)-(3-iodoallyl)trimethylsilane with various Grignardreagents. The reaction of the allylsilanes