Preparation of aryl-substituted butenolides using mucohalic acids
申请人:Blazecka Garth Peter
公开号:US20050131239A1
公开(公告)日:2005-06-16
Methods and materials for preparing 3-aryl-2-buten-4-olides and 2,3-bisaryl-2-buten-4-olides are disclosed. The methods include reacting a mucohalic acid with a reducing agent to give a 2,3-dihalo-2-buten-4-olide, which undergoes at least one Pd catalyzed cross-coupling reaction with an arylboronic acid.
Quick construction of a C–N bond from arylsulfonyl hydrazides and C<sub>sp2</sub>–X compounds promoted by DMAP at room temperature
作者:Kai Yang、Juan-Juan Gao、Shi-He Luo、Han-Qing Wu、Chu-Ming Pang、Bo-Wen Wang、Xiao-Yun Chen、Zhao-Yang Wang
DOI:10.1039/c9ra03403j
日期:——
A mild C–N coupling reaction with arylsulfonyl hydrazides and 2(5H)-furanones shows good yields, excellent reaction regioselectivity and functional group tolerance.
Copper(I)-Catalyzed Alkyl- and Arylsulfenylation of 3,4-Dihalo-2(5<i>H</i>
)-furanones (X=Br, Cl) with Sulfoxides under Mild Conditions
作者:Liang Cao、Shi-He Luo、Han-Qing Wu、Liu-Qing Chen、Kai Jiang、Zhi-Feng Hao、Zhao-Yang Wang
DOI:10.1002/adsc.201700600
日期:2017.9.4
An efficient copper(I)/proline sodium salt‐catalyzed alkyl‐ and arylsulfenylation of C(sp2)–X 3,4‐dihalo‐2(5H)‐furanone compounds with sulfoxides is described. For inexpensive C(sp2)–Cl compounds, there is also a satisfactory reactivity with the moderate yields. This transformation provides a novel approach for the utilization of sulfoxides (not only DMSO) as sulfur source at mild temperatures without
Process for preparing highly functionalized gamma-butyrolactams and gamma-amino acids
申请人:——
公开号:US20030225149A1
公开(公告)日:2003-12-04
The invention relates to a process for preparing highly functionalized &ggr;-butyrolactams and &ggr;-amino acids by reductive amination of mucohalic acid or its derivatives, and discloses a process for preparing pregabalin, a GABA analog with desirable medicinal activity.
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A 3,4-dihalo-2(5<i>H</i>)-furanone initiated ring-opening reaction of DABCO in the absence of a metal catalyst and additive and its application in a one-pot two-step reaction
作者:Han-Qing Wu、Kai Yang、Xiao-Yun Chen、Mani Arulkumar、Neng Wang、Si-Hong Chen、Zhao-Yang Wang
DOI:10.1039/c9gc01740b
日期:——
In the absence of metal catalysis and an additive, with ethyl acetate as a solvent at 95 °C under air atmosphere for 2 h, an eco-friendly and practical protocol for the synthesis of 4-ethylpiperazine derivatives through a 3,4-dihalo-2(5H)-furanone initiated ring-opening reaction of DABCO is developed. Satisfactory reactivity with moderate to excellent yields and 100% atom economy are observed. This