New CC Bond Formation via Nonstoichiometric Titanium(IV) Halide Mediated Vicinal Difunctionalization of α,β-Unsaturated Acyclic Ketones
作者:Guigen Li、Joe Gao、Han-Xun Wei、Mason Enright
DOI:10.1021/ol9904040
日期:2000.3.1
[reaction: see text] Highly stereoselective vicinal difuctionalization of alpha,beta-unsaturated ketones for the synthesis of multifunctionalized trisubstituted alkenes is described. The new reaction employs titanium(IV) halides (0.5 equiv) as promoters and inexpensive commercial chemicals as starting materials. The reaction can be performed at room temperature in a convenient vial without the protection
Amine and Titanium (IV) Chloride, Boron (III) Chloride or Zirconium (IV) Chloride-Promoted Baylis-Hillman Reactions
作者:Min Shi、Jian-Kang Jiang、Shi-Cong Cui
DOI:10.3390/61100852
日期:——
Baylis-Hillman reactions of various aryl aldehydes with methyl vinyl ketone at temperatures below -20oC using Lewis acids such as titanium (IV) chloride, boron (III) chloride or zirconium (IV) chloride in the presence of a catalytic amount of selected amines used as a Lewis bases afford the chlorinated compounds 1 as the major product in very high yields. Acrylonitrile can also undergo the same reaction to give
Amendment in Titanium(IV) Chloride and Chalcogenide-Promoted Baylis–Hillman Reaction of Aldehydes with α,β-Unsaturated Ketones
作者:Min Shi、Jian-Kang Jiang
DOI:10.1016/s0040-4020(00)00384-7
日期:2000.6
The Baylis–Hillman reaction can be drastically affected by the reaction temperature and Lewis base. When the reaction was carried out at <−20°C using methyl sulfide as a Lewis base in the presence of titanium(IV) chloride, the chlorinated compound 1 was obtained as the major product. However, if the reaction was carried out at room temperature (10°C) in the presence of titanium(IV) chloride, the elimination
Dimethyl sulfide–boron trihalide-mediated reactions of α,β-unsaturated ketones with aldehydes: one-pot synthesis of Baylis–Hillman adducts and α-halomethyl enones
The reactions of aldehydes with 3-buten-2-one (2) were conducted in the presence of (BBr3Me2S)-Me-. or BCl3-Me2S and then worked up with aqueous NaHCO3, affording the a-methylene aldol 3, (alpha -halomethyl aldol 4 or 6, and a-halomethyl enones 5 or 7, respectively. In contrast, the reactions quenched with water gave the alpha -halomethyl enones 5 or 7 in high yields, while the work-up with an aqueous 10% trimethylamine gave the alpha -methylene aldol 3. The phenol 15 and half-acetal 16 were obtained from the reaction of p-nitrobenzaldehyde (1a) with cyclohexenone (10). (C) 2001 Elsevier Science Ltd. All rights reserved.