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
Efficient nucleophilic substitution reactions of highly functionalized allyl halides in ionic liquid media
作者:S.R.S.Saibabu Kotti、Xin Xu、Guigen Li、Allan D. Headley
DOI:10.1016/j.tetlet.2003.12.051
日期:2004.2
Nucleophilicsubstitution reactions of highly functionalized allyl halides with three anions, N3−, AcO−, and PhSO2−, in ionicliquid media were conducted. The ionicliquid, [Bmim][BF4], was found to be superior to classical organic solvents to give higher yields and faster reaction rates. The resulting products belong to multifunctionalized trisubstituted α,β-unsaturated ketones, which are useful building