Bisphosphine catalyzed sequential [3 + 2] cycloaddition and Michael addition of ynones with benzylidenepyrazolones <i>via</i> dual α′,α′-C(sp<sup>3</sup>)–H bifunctionalization to construct cyclopentanone-fused spiro-pyrazolones
作者:Jiayong Zhang、Zhiwei Miao
DOI:10.1039/c8ob02675k
日期:——
A bisphosphine-catalyzed sequential [3 + 2] cycloaddition and Michael addition reaction of ynones with benzylidenepyrazolones has been developed. Under the catalysis of DPPB [1,4-bis(diphenylphosphino)butane], the reaction proceeded smoothly to give spiro-[cyclopentanone] pyrazolone derivatives in moderate to good yields with good diastereoselectivities via sequential dual α′,α′-C(sp3)–H bifunctionalization
Organophosphane-Catalyzed Direct β-Acylation of 4-Arylidene Pyrazolones and 5-Arylidene Thiazolones with Acyl Chlorides
作者:Pankaj V. Khairnar、Yin-Hsiang Su、Yung-Chang Chen、Athukuri Edukondalu、Yi-Ru Chen、Wenwei Lin
DOI:10.1021/acs.orglett.0c02408
日期:2020.9.4
An efficient method for the direct β-acylation of arylidene pyrazolones and thiazolones with acyl chlorides in the presence of a base catalyzed by organophosphanes is reported. A variety of functionalized 4-arylidene pyrazolone and 5-arylidene thiazolonederivatives were prepared under metal-free and mild conditions via a tandem phospha-Michael addition/O-acylation/intramolecular cyclization/rearrangement
A PPh<sub>3</sub>-catalyzed sequential annulation reaction to construct cyclopentane-fused dihydropyrazolone-pyrrolidinediones
作者:Cheng Cheng、Xiaobin Sun、Zhiwei Miao
DOI:10.1039/d0ob00815j
日期:——
An effective strategy for the synthesis of cyclopentane-fused dihydropyrazolone-pyrrolidinediones via a PPh3-catalyzed sequential annulation reaction of maleimides and unsaturated pyrazolones has been developed.
Construction of highly substituted pyrazole derivatives with P–C bond: access to racemic and enantioselective forms by conjugate addition of diarylphosphane oxides to α,β-unsaturated pyrazolones
作者:Zhi-Cong Geng、Jin-Xin Zhang、Ning Li、Jian Chen、Xiao-Fei Huang、Shao-Yun Zhang、Hai-Yan Li、Jing-Chao Tao、Xing-Wang Wang
DOI:10.1016/j.tet.2013.11.038
日期:2014.1
The synthesis of organophosphorus compounds is of great importance to industrial, agricultural, and pharmaceutical chemistry. In this paper, we have reported the synthesis of highly substituted pyrazole derivatives through P–C bond formation under catalyst-free conditions. On the other hand, the first catalytic asymmetric version of this reaction has also been developed under catalysis by an isosteviol
A nitrogen-containing Lewis base catalyzed highly regioselective [4 + 2] cycloaddition of allene ketones or α-methyl allene ketones with unsaturated pyrazolones has been disclosed to give the corresponding tetrahydropyrano [2,3-c] pyrazoles in moderate to good yields under mild conditions. High regioselectivity, 100% atom-economy, broad substrate scope and good functional group tolerance are attractive
已经公开了含氮的路易斯碱催化的烯丙基酮或α-甲基烯丙基酮与不饱和吡唑酮的高度区域选择性[4 + 2]环加成反应,在温和的条件下,以中等至良好的收率得到相应的四氢吡喃并[2,3- c ]吡唑情况。高区域选择性,100%原子经济性,宽泛的底物范围和良好的官能团耐受性是该方法的诱人之处,使其成为一种实用且用途广泛的转化方法。