Synthesis of Allylboranes via Cu(I)-Catalyzed B–H Insertion of Vinyldiazoacetates into Phosphine–Borane Adducts
作者:Denis Drikermann、Robert S. Mößel、Walid K. Al-Jammal、Ivan Vilotijevic
DOI:10.1021/acs.orglett.9b04619
日期:2020.2.7
Cu(I) catalysts enable C-B bond formation via direct insertion of vinyldiazoacetates into B-H bonds of borane-phosphine Lewis adducts to form phosphine-protected allylboranes under mild conditions. The resulting allylborane-phosphine Lewis adducts can be used in the diastereoselective allylation of aldehydes directly without the need for removal of the phosphine. The allylation reaction proceeds with
Two different cyclic amino esters are synthesized by palladium-catalyzed cross-coupling reaction of diazoesters with N-substituted-2-iodoanilines. Aryldiazoacetates lead to cyclic α-amino esters with an α-quaternary carbon centre in the presence of CO. Additionally, arylvinyldiazoacetates afford cyclic α,β-unsaturated γ-amino esters.
Rhodium-Catalyzed 1,4-Aryl Rearrangement of Sulfur Ylide for the Synthesis of 2-Pyridyl Thioethers
作者:Jie Wang、Qing-Yang Li、Shan-Shan Wang、Xin-Yan Wu、Xingguang Li、Pei-Nian Liu
DOI:10.1021/acs.orglett.3c00068
日期:2023.2.3
We report a novel rhodium-catalyzed rearrangement involving N-substituted 2-thiopyridones and diazoesters. This reaction proceeds through the rhodium-catalyzed formation of sulfur ylides, followed by a direct C–N bond cleavage to achieve N-to-C 1,4-pyridyl migration. The protocol can be used to construct various thiopyridines possessing tetrasubstituted carbon stereocenters in moderate to excellent
我们报告了一种新型的铑催化重排,涉及 N-取代的 2-硫代吡啶酮和重氮酯。该反应通过铑催化形成硫叶立德,然后直接裂解 C-N 键实现 N-至 C 1,4-吡啶基迁移。该方案可用于构建各种具有四取代碳立构中心的硫代吡啶,收率中等至极佳,从而扩展了硫叶立德中间体在重排反应中的转化模式。