报道了一种通过S N 2'机理进行铜催化的乙烯基环状碳酸酯的硼烷基甲基化和硼化的方法。这些奇异反应包括选择性的S N 2'烯丙基取代,伴随有环状碳酸酯的开环,以及CO 2的挤出和在单个步骤中形成有用的羟基官能团。可以控制均烯丙基硼化和烯丙基硼化过程的立体选择性,并且合成上有用的不饱和(E)-戊-2-烯-1,5-二醇和(E)-丁-2-烯-1,4-二醇是访问。
Chiral Bidentate Phosphoramidite-Pd Catalyzed Asymmetric Decarboxylative Dipolar Cycloaddition for Multistereogenic Tetrahydrofurans with Cyclic <i>N</i>-Sulfonyl Ketimine Moieties
作者:Hao-Peng Lv、Xiao-Peng Yang、Bai-Lin Wang、Hao-Di Yang、Xing-Wang Wang、Zheng Wang
DOI:10.1021/acs.orglett.1c01411
日期:2021.6.18
An asymmetric [3 + 2] cycloaddition of vinyl ethylenecarbonates (VECs) and (E)-3-arylvinyl substituted benzo[d] isothiazole 1,1-dioxides has been developed using the Pd complex of a bidentate phosphoramidite (Me-BIPAM) as the catalyst, providing a wide variety of chiral multistereogenic vinyltetrahydrofurans in good yields with excellent diastereo- and enantioselectivities (up to >20:1 dr, 99% ee)
Palladium‐Catalyzed Decarboxylative Cycloaddition of Vinylethylene Carbonates with Formaldehyde: Enantioselective Construction of Tertiary Vinylglycols
An efficient method for the enantioselectiveconstruction of tertiaryvinylglycols through a palladium‐catalyzed asymmetric decarboxylativecycloaddition of vinylethylenecarbonates with formaldehyde was developed. By using a palladium complex generated in situ from [Pd2(dba)3]⋅CHCl3 and a phosphoramidite ligand as a catalyst under mild reaction conditions, the process allows conversion of racemic
Asymmetric Synthesis of Multi‐Substituted Tetrahydrofurans via Palladium/Rhodium Synergistic Catalyzed [3+2] Decarboxylative Cycloaddition of Vinylethylene Carbonates
作者:Siliang Ming、Saira Qurban、Yu Du、Weiping Su
DOI:10.1002/chem.202102024
日期:2021.9.6
efficient synergistic catalysis for the diastereo- and enantioselectivesynthesis of multi-substituted tetrahydrofuran derivatives has been developed. Under mild reaction conditions, a series of target molecules with three consecutive stereocenters were synthesized by a palladium(0)/rhodium(III) bimetal-catalyzed asymmetricdecarboxylative [3+2]-cycloaddition of vinylethylene carbonates with α,β-unsaturated
Rhodium‐Catalyzed Decarboxylative Hydroacylation of Vinylethylene Carbonates for Regioselective Ester Synthesis
作者:Fei‐Yuan Gong、Gui‐Li Guo、Zhi‐Xin Chang、Xue‐Ming Lu、Fu‐Gang Wang、Lei Wang、Hong‐Shuang Li
DOI:10.1002/adsc.202200147
日期:2022.5.17
A rhodium(I)-catalyzed decarboxylativehydroacylation of readily available vinylethylenecarbonates with salicylaldehydes for regioselective preparation of esters was developed. Reaction optimization revealed that methacrylamide might promote the hydroacylation by bidentate chelation assistance to the cationic rhodium. Mechanistic findings suggested that this one-pot coupling reaction proceeds via
开发了一种铑 (I) 催化的容易获得的乙烯基碳酸亚乙酯与水杨醛的脱羧加氢酰化反应,用于区域选择性制备酯。反应优化表明甲基丙烯酰胺可能通过对阳离子铑的双齿螯合辅助促进氢化酰化。机理研究结果表明,这种一锅法偶联反应通过马尔科夫尼科夫氢化引发的位点选择性β -C-O 键断裂和 CO 2的同时释放进行。
Stereoselective Synthesis of Tri- and Tetrasubstituted Allylsilanes via Copper-Catalyzed Decarboxylative Silylation of Vinylethylene Carbonates
作者:Wenzhu Ren、Yifei Yan、Yinhua Huang
DOI:10.1021/acs.joc.3c01297
日期:2023.12.15
Herein, a stereoselective copper-catalyzed decarboxylative silylation of readily available vinylethylene carbonates (VECs) with PhMe2Si-Bpin is reported, affording a wide range of tri- and tetrasubstituted allylsilanes in moderate to highyields with E-selectivity. This protocol was characterized by highstereoselectivity, broad substrate scope, operational simplicity, and mild reaction conditions