Pd(II)-catalyzed C–H functionalization of nondirected arenes has been realized using an inexpensive and easily accessible type of bidentate S,O-ligand. The catalytic system shows high efficiency in the C–Holefination reaction of electron-rich and electron-poor arenes. This methodology is operationally simple, scalable, and can be used in late-stage functionalization of complex molecules. The broad
Sequential Catalyst Phosphine/Secondary Amine Promoted [1+4]/Rearrangement Domino Reaction for the Construction of (2<i>H</i>)-Pyrans and 2-Oxabicyclo[2.2.2]oct-5-ene Skeletons
作者:Peizhong Xie、Jie Yang、Jie Zheng、You Huang
DOI:10.1002/ejoc.201301872
日期:2014.2
Sequentialcatalysis of a [2+4] reaction between a Baylis–Hillman carbonate and a β,γ-unsaturated α-oxo ester for the synthesis of 2-methyl-2H-pyran was developed. The use of a Morita–Baylis–Hillman carbonate as a C2 synthon is first disclosed in this reaction. This method offers a new approach to the construction of 2-methyl-2H-pyrans and 2-oxabicyclo[2.2.2]oct-5-ene skeletons.
Unsaturated Phosphonates as Hauser Acceptors for the Synthesis of Phosphonylated Dihydroxynaphthalenes and Naphthoquinones
作者:Atul Kumar Chaturvedi、Namrata Rastogi
DOI:10.1021/acs.joc.6b00312
日期:2016.4.15
The unsaturated phosphonates were utilized as Hauser acceptors successfully for the first time. The products phosphonylated 1,4-dihydroxynaphthalenes were isolated in good yields in short reaction time and were further oxidized to the corresponding 1,4-naphthoquinones in quantitative yields. The reaction provides an efficient and straightforward approach for the synthesis of pharmacologically privileged