Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones
作者:Xiaolong Su、Honggui Huang、Yaofeng Yuan、Yi Li
DOI:10.1002/anie.201608507
日期:2017.1.24
efficient oxidative radical desulfur‐fragmentation and reconstruction of enoltriflates for the synthesis of α‐CF3 ketones. Preliminary mechanistic studies disclosed that oxidative fragmentation to release a CF3 radical from the triflyl group of enoltriflate and subsequent addition of the CF3 radical to another enoltriflate form the desired α‐CF3 ketones. This method provides a new approach to α‐CF3
Nickel‐Catalyzed Regioselective Alkenylarylation of γ,δ‐Alkenyl Ketones via Carbonyl Coordination
作者:Roshan K. Dhungana、Vivek Aryal、Doleshwar Niroula、Rishi R. Sapkota、Margaret G. Lakomy、Ramesh Giri
DOI:10.1002/anie.202104871
日期:2021.8.23
which enabled us to difunctionalize unactivated γ,δ-alkenes in ketones with alkenyl triflates and arylboronic esters. The reaction was made feasible by the use of 5-chloro-8-hydroxyquinoline as a ligand along with NiBr2⋅DME as a catalyst and LiOtBu as base. The reaction proceeded with a wide range of cyclic, acyclic, endocyclic and exocyclic alkenylketones, and electron-rich and electron-deficient arylboronate
我们公开了镍催化的反应,该反应使我们能够用三氟甲磺酸烯基酯和芳基硼酸酯对酮中未活化的γ,δ-烯烃进行双官能化。通过使用 5-氯-8-羟基喹啉作为配体以及 NiBr 2· DME 作为催化剂和 LiO t Bu 作为碱,使该反应变得可行。该反应适用于各种环状、无环、环内和环外烯基酮,以及富电子和缺电子芳基硼酸酯。该反应也适用于环状和无环烯基三氟甲磺酸酯。对照实验表明反应的进行需要羰基配位。
Ni(I)-Catalyzed β,δ-Vinylarylation of γ,δ-Alkenyl α-Cyanocarboxylic Esters via Contraction of Transient Nickellacycles
作者:Roshan K. Dhungana、Shekhar KC、Prakash Basnet、Vivek Aryal、Lucas J. Chesley、Ramesh Giri
DOI:10.1021/acscatal.9b03574
日期:2019.12.6
α-cyanocarboxylic esters with vinyl triflates and arylzinc reagents. This reaction proceeds via contraction of six-membered nickellacycles to five-membered nickellacycles to form carbon–carbon bonds at the nonclassical homovicinal sites, and it provides expeditious access to a wide range of complex aliphatic α-cyanoesters, α-cyanocarboxylic acids, dicarboxylic acids, dicarboxylic acid monoamides, monocarboxylic
Vinyl Carbocations: Solution Studies of Alkenyl(aryl)iodonium Triflate Fragmentations
作者:Anne J. McNeil、Robert J. Hinkle、E. Ashley Rouse、Quinn A. Thomas、David B. Thomas
DOI:10.1021/jo015746+
日期:2001.8.1
reaction with rearranged secondary cations derived from those salts. G2 calculations of the theoretical isodesmic hydride-transfer reaction between secondary vinyl cation 7 and primary vinyl cation 6 reveal that cation 6 is 17.8 kcal/mol higher in energy. Activation parameters for fragmentation of (Z)-2-ethyl-1-hexenyl(3,5-bis-trifluoromethylphenyl)iodonium triflate, 17e, were calculated using the Arrhenius
A radical 1,4-aryl migration enabling a cross-electrophile coupling reaction toward remote transalkylation of N-benzyl alanine has been developed. In this strategy, with the occurrence of a radical-mediated Turce-Smiles rearrangement, key α-aminoalkyl radicals are generated. The as-formed α-aminoalkyl radical serves as a robust coupling partner for cross-electrophilic coupling with vinyl triflates