Phosphine-Mediated MBH-Type/Umpolung Addition Domino Sequence: Divergent Construction of Coumarins
作者:Zhi-Xiong Deng、Yu Zheng、Zhen-Zhen Xie、Yue-Heng Gao、Jun-An Xiao、Si-Qi Xie、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.orglett.9b04248
日期:2020.1.17
We herein report a phosphine-mediated domino process of MBH-type reaction/umpolung γ-addition through the rational integration of the privileged reactivities of alkynoate. Simply by manipulating the nucleophilic reagent, the developed protocol offers a facile, diversity-oriented construction of a wide range of three-substituted coumarins.
Control of Chemoselectivity by Counteranions of Cationic Palladium Complexes: A Convenient Enantioselective Synthesis of Dihydrocoumarins
作者:Xiuling Han、Xiyan Lu
DOI:10.1021/ol902538n
日期:2010.1.1
High chemoselectivity for the synthesis of two kinds of substituted coumarins controlled by the counteranions of the cationic palladium catalysts is described. The asymmetric version of the reaction for the synthesis of 3-alkylldene dihydrocoumarins is realized with high enantioselectivity.