Palladium-Catalyzed Diastereoselective Formal [5 + 3] Cycloaddition for the Construction of Spirooxindoles Fused with an Eight-Membered Ring
作者:Ben Niu、Xiao-Yun Wu、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.9b01748
日期:2019.6.21
A Pd-catalyzed formal [5 + 3] intermolecular cycloaddition reaction of isatin-derived α-(trifluoromethyl)imines with aryl substituted vinylethylene carbonates (VECs) has been reported, affording trifluoromethyl-group-containing spirooxindoles fused with an eight-membered ring as a single diastereoisomer in good yields in the presence of a Brønsted acid in a one-pot manner under mild conditions. The
Vinylethylene Carbonates as <i>α,β</i>-Unsaturated Aldehyde Surrogates for Regioselective [3 + 3] Cycloaddition
作者:Yi Xu、Lu Chen、Yu-wen Yang、Zhiqiang Zhang、Weibo Yang
DOI:10.1021/acs.orglett.9b02266
日期:2019.9.6
operationally simple [3 + 3] cycloaddition of vinylethylene carbonates with triazinanes. Interestingly, we could also use this method for a [3 + 3] oxidative cycloaddition, which allows the facile synthesis of polysubstituted terphenyls under mild conditions. Mechanistic studies suggest that vinylethylene carbonates could generate α,β-unsaturatedaldehydes as 3-carbon synthons for cycloaddition via a combination
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)
Divergent synthesis of N-heterocycles by Pd-catalyzed controllable cyclization of vinylethylene carbonates
作者:Yuwen Yang、Weibo Yang
DOI:10.1039/c8cc06945j
日期:——
Here, we report a palladium-catalyzed controllable cyclization of vinyl ethylene carbonates that proceeds through formal migration [2+3] and [5+2] cycloadditions, respectively, under mild conditions.
Diversity‐Orientated Stereoselective Synthesis through Pd‐Catalyzed Switchable Decarboxylative C−N/C−S Bond Formation in Allylic Surrogates
作者:Lei Deng、Arjan W. Kleij、Weibo Yang
DOI:10.1002/chem.201805295
日期:2018.12.20
diversity‐orientated synthesis from easily available molecular synthons. Herein, an endogenous ligand‐controlled, Pd‐catalyzed allylic substitution allowing for either selective C−N or C−Sbondformation using vinylethylene carbonates (VECs) and N‐sulfonylhydrazones as coupling partners has been developed. This versatile methodology provides a facile, divergent route for the highly chemo‐ and stereoselective