Chloride-Tolerant Gold(I)-Catalyzed Regioselective Hydrochlorination of Alkynes
作者:Rene Ebule、Shengzong Liang、Gerald B. Hammond、Bo Xu
DOI:10.1021/acscatal.7b02567
日期:2017.10.6
We have developed a highly regioselective homogeneous gold(I)-catalyzed anti-hydrochlorination of unactivated alkynes at room temperature. We have overcome the incompatibility between conventional cationic gold catalysts and chloride by using a hydrogen-bonding activation of the Au–Cl bond. This approach is scalable, exhibits excellent functional group tolerance, and can be conducted in open air.
Reactions of coordinated geminal dichromium reagents with aldehydes: stereoselective formation of (Z)-2-chloroalk-2-en-1-ols
作者:Kazuhiko Takai、Ryo Kokumai、Takahumi Nobunaka
DOI:10.1039/b102387j
日期:——
Treatment of a carbonate ester of 2,2,2-trichloroethanol
derivative with CrCl2–DMF in THF gives a
β-carbonate-coordinated geminal dichromium species, which adds to an
aldehyde and eliminates an acyloxychromium group to afford a
(Z)-2-chloroalk-2-en-1-ol stereoselectively.
Stereoselective Synthesis of <i>Z</i> Alkenyl Halides via Julia Olefination
作者:Marie-Eve Lebrun、Paul Le Marquand、Carl Berthelette
DOI:10.1021/jo052370h
日期:2006.3.1
Julia olefination between alpha-halomethyl sulfones and a variety of aldehydes afforded alkenyl halides in good to excellent yields with high E/Z stereo selectivities. Sulfones were readily prepared in two or three steps from commercially available reagents in good yields. Optimization revealed that the nature of the Z solvent, the base, and the additive were crucial to obtain the desired alkenyl halides.
.alpha.-Halo sulfones. VII. The Ramberg-Baecklund rearrangement of .alpha.,.alpha.-dichloromethyl sulfones
作者:Leo A. Paquette、Lawrence S. Wittenbrook、Vinayak V. Kane
DOI:10.1021/ja00993a043
日期:1967.8
Bert, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1925, vol. 180, p. 1505