Copper-Catalyzed Intermolecular Trifluoromethylazidation and Trifluoromethylthiocyanation of Allenes: Efficient Access to CF<sub>3</sub>-Containing Allyl Azides and Thiocyanates
作者:Na Zhu、Fei Wang、Pinhong Chen、Jinxing Ye、Guosheng Liu
DOI:10.1021/acs.orglett.5b01677
日期:2015.7.17
A mild and efficient method for copper-catalyzedtrifluoromethylazidation and trifluoromethylthiocyanation of allenes was explored. A series of CF3-containing allyl azides and thiocyanates were obtained with high yields and good stereoselectivities, which can be used for further transformation to some valuable compounds.
A Convergent, Unified Approach to Functionalized Fluoro- and Trifluoromethyl Alkenes
作者:Laurent Debien、Béatrice Quiclet-Sire、Samir S. Zard
DOI:10.1021/ol3023903
日期:2012.10.5
A modular, convergent, and operationally simple route to trifluoromethyl alkenes and vinyl fluorides involving a unique carbon–oxygen bond homolysis is reported. Highly functionalized trifluoromethyl alkenes and vinyl fluorides were obtained in good yields and good selectivity.
Fluorinative Rearrangements of Substituted Phenylallenes Mediated by (Difluoroiodo)toluene: Synthesis of α-(Difluoromethyl)styrenes
作者:Zhensheng Zhao、Léanne Racicot、Graham K. Murphy
DOI:10.1002/anie.201706798
日期:2017.9.11
(difluoroiodo)toluene in the presence of 20 mol % BF3⋅OEt2 to yield α‐difluoromethyl styrenes. This unprecedented reaction was entirely chemoselective for the internal allene π bond, and showed remarkable regioselectivity during the fluorination event. Substituted phenylallenes, phenylallenes possessing both phenyl‐ and α‐allenyl substituents, and diphenylallenes were investigated, and good functional‐group
Catalytic Regio- and Enantioselective [4+2] Annulation Reactions of Non-activated Allenes by a Chiral Cationic Indium Complex
作者:Le Wang、Jian Lv、Long Zhang、Sanzhong Luo
DOI:10.1002/anie.201704020
日期:2017.8.28
Regio‐ and enantioselective [4+2] annulation between β,γ‐unsaturated α‐keto esters and non‐activated allenes was achieved by using a chiral cationic indium(III)/phosphate catalyst. The reaction affords the corresponding C3‐selective dihydropyrans in good yields and with high enantioselectivity (up to 99 % ee).
Palladium(II)-Catalyzed Annulation between <i>ortho</i>-Alkenylphenols and Allenes. Key Role of the Metal Geometry in Determining the Reaction Outcome
作者:Noelia Casanova、Karina P. Del Rio、Rebeca García-Fandiño、José L. Mascareñas、Moisés Gulías
DOI:10.1021/acscatal.6b00739
日期:2016.5.6
2-Alkenylphenols react with allenes, upon treatment with catalytic amounts of Pd(II) and Cu(II), to give benzoxepine products in high yields and with very good regio- and diastereoselectivities. This contrasts with the results obtained with Rh catalysts, which provided chromene-like products through a pathway involving a β-hydrogen elimination step. Computational studies suggest that the square planar