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)。
(2,7-Disubstituted-1,8-biphenylenedioxy)bis(dimethylaluminum) as Bidentate Organoaluminum Lewis Acids: Elucidation and Synthetic Utility of the Double Electrophilic Activation Phenomenon
temperature; this primarily relies on the successful establishment of a new synthetic procedure of 1 starting from inexpensive m-anisidine. Evaluation of 2 as a bidentate organoaluminum Lewisacid has been performed by the reduction of ketonic substrates using Bu3SnH as a hydride source in comparison to the conventional monodentate Lewisacid dimethylaluminum 2,6-xylenoxide (11), uncovering the significantly
Transposition eventuelle lors de l'action de bromures β-ethyleniques CH2CHCH(R)CH2Br (R = CHCH2, C2H5, C6H5) sur le magnesium
作者:F. Gerard、Ph. Miginiac
DOI:10.1016/s0022-328x(00)87055-2
日期:1976.5
Reaction betweenβ-ethylenic bromides CH2CHCH(R)CH22Br and magnesium in ether has been studied. With R = CHCH2, it gives rise both to normal and rearranged Grignard reagents. With R = C2H5 and C6H5, only the normal Grignard reagent is formed.
反应betweenβ烯溴化物CH 2 CHCH(R)CH 2 2BR和在乙醚中的镁进行了研究。当R = CH = CH 2时,它会同时产生正常和重排的格氏试剂。当R = C 2 H 5和C 6 H 5时,仅形成普通的格氏试剂。
Ooi, Takashi; Takahashi, Makoto; Maruoka, Keiji, Journal of the American Chemical Society, 1996, vol. 118, # 45, p. 11307 - 11308
作者:Ooi, Takashi、Takahashi, Makoto、Maruoka, Keiji
DOI:——
日期:——
Highly Chemoselective Catalytic Hydrogenation of Unsaturated Ketones and Aldehydes to Unsaturated Alcohols Using Phosphine-Stabilized Copper(I) Hydride Complexes
作者:Jian-Xin Chen、John F. Daeuble、Donna M. Brestensky、Jeffrey M. Stryker
DOI:10.1016/s0040-4020(99)01098-4
日期:2000.4
phenyldimethylphosphine-stabilized copper(I) hydride complex provides for the highly chemoselective hydrogenation of unsaturated ketones and aldehydes to unsaturated alcohols, including the regioselective 1,2-reduction of α,β-unsaturated ketones and aldehydes to allylic alcohols. The active catalyst can be derived in situ by phosphine exchange using commercial [(Ph3P)CuH]6 or from the reaction of copper(I) chloride