A general and efficient Pd/phosphoramidite thioether complex-catalyzed asymmetric N-allylic alkylation of hydrazones with allylicacetates has been developed for the first time. The reaction allows for the preparation of various valuable N-substituted hydrazones with generally good yields and excellent enantioselectivities. Minor structural modification of the ligand resulted in opposite enantiomers
Pd-Catalyzed Allylic Alkynylation of Allylic Acetates with Terminal Alkynes
作者:Qingjing Yang、Yongyun Zhou、Jingchao Chen、Xiaobo He、Jianbin Xu、Fuk Yee Kwong、Baomin Fan
DOI:10.1002/ejoc.201500522
日期:2015.8
The first palladium-catalyzed allylicalkynylation reaction of allylicacetates with terminalalkynes has been realized. By empolying AgOTf as a cooperative catalyst, 1,4-enynes were synthesized in up to 98 % yield under mild conditions. Moreover, the possible asymmetric version of this allylicalkynylation reaction was demonstrated.
A new type of chiral sulfoxide-phosphine ligands have been developed by a rational combination of two privileged scaffolds for Pd-catalyzed asymmetric allylicalkylation reactions. Under optimized conditions, generally high yields (up to 97%) and excellent enantioselectivities (up to >99% ee) were obtained.
Pd-Catalyzed Asymmetric Allylic Alkylation of Indoles and Pyrroles by Chiral Alkene-Phosphine Ligands
作者:Ziping Cao、Yilin Liu、Zhaoqun Liu、Xiangqing Feng、Minyang Zhuang、Haifeng Du
DOI:10.1021/ol200602x
日期:2011.5.6
A variety of chiral binaphthyl-based terminal-alkene-phosphine hybrid ligands were synthesized in four steps with (S)-BINOL as a starting material and utilized for the Pd-catalyzed enantioselective allylicalkylations of indoles and pyrroles to afford the desired products in high yields with good to excellent ee’s.