R3Al, promote the Claisenrearrangement of allyl vinyl ether derivatives at room temperature under transfer of R or H as a nucleophile to the aldehydic carbon. Treatment of 1-butyl-2-propenyl vinyl ether with a hexane solution of Me3Al (1.0 M, 2.2 equiv) in CH2ClCH2Cl at 25 °C afforded 5-decen-2-ol (91% yield, E⁄Z=47⁄53), which was produced by the [3,3] sigmatropic rearrangement and successive methylation
有机铝化合物 R3Al 在室温下在 R 或 H 作为亲核试剂转移到醛碳的情况下促进烯丙基乙烯基醚衍生物的克莱森重排。在 25 °C 下,用 Me3Al(1.0 M,2.2 当量)在 CH2ClCH2Cl 中的己烷溶液处理 1-丁基-2-丙烯基乙烯基醚得到 5-癸烯-2-醇(产率 91%,E⁄Z=47⁄53 ),这是由 [3,3] sigmatropic 重排和连续甲基化产生的。还实现了炔基化、烯基化和氢化的重排。使用 Et2AlSPh(2.5 equiv)或 Et2AlCl(2.0 equiv)和 PPh3(2.2 equiv)的组合,在 25 °C 下获得了常规的 Claisen 重排产物或 γ,δ-不饱和醛(酮)。
Nonshita, Katsumasa; Banno, Hiroshi; Maruoka, Keiji, Journal of the American Chemical Society, 1990, vol. 112, # 1, p. 316 - 322
An Expedient Synthesis of Olfactory Lactones by Intramolecular Hydroacylalkoxylation Reactions
作者:Luis A. Adrio、King Kuok Mimi Hii
DOI:10.1002/ejoc.201001556
日期:2011.4
available chiral precursor. By using an intramolecular hydroacylalkoxylation reaction in the final step, a correlation between the (E)/(Z) configuration of the precursor and the product distribution has been established, for the first time, in this type of cyclisation reactions.