Regioselective Radical Borylation of α,β-Unsaturated Esters and Related Compounds by Visible Light Irradiation with an Organic Photocatalyst
作者:Guosong Li、Guanwang Huang、Ruixia Sun、Dennis P. Curran、Wen Dai
DOI:10.1021/acs.orglett.1c01270
日期:2021.6.4
recently been reported and are still rare. Here we describe a photoredox radical hydroboration of α,β-unsaturatedesters, amides, ketones, and nitriles with NHC-boranes that uses only an organocatalyst and visible light. The conditions are mild, the substrate scope is broad, and the α/β regioselectivity is high. The reaction requires only the organocatalyst; there is no costly metal, and there are no
Several 2-alkylcarbamoyl-1-alkylvinylbenzo[b]furans were designed to find a selective leukotriene B4 (LTB4) receptor antagonist. 2-(2-Alkylcarbamoyl-1-alkylvinyl)benzo[b]furans having a substituent group at the 3-position, 4-(2-alkylcarbamoyl-1-methylvinyl)benzo[b]furans having a substituent group at the 3-position, and 7-(2-alkylcarbamoyl-1-methylvinyl)benzo[b]furans and 3-(2-alkylcarbamoyl-1-alkylvinyl)benzo[b]furans were prepared and evaluated for LTB4receptor (BLT1 and BLT2) inhibitory activities. (E)-3-Amino-4-[2-[2-(3,4-dimethoxyphenyl)ethylcarbamoyl]-1-methylvinyl]benzo[b]furan ((E)-17c) showed potent and selective inhibitory activity for BLT2. On the other hand, (E)-7-(2-diethylcarbamoyl-1-methylvinyl)benzo[b]furan ((E)-27a) showed potent inhibitory activity for both BLT1 and BLT2.
Cross-Coupling of Acrylamides and Maleimides under Rhodium Catalysis: Controlled Olefin Migration
作者:Satyasheel Sharma、Sang Hoon Han、Yongguk Oh、Neeraj Kumar Mishra、Suk Hun Lee、Joa Sub Oh、In Su Kim
DOI:10.1021/acs.orglett.6b00909
日期:2016.6.3
The rhodium(III)-catalyzed direct cross-coupling reaction of electron-deficient acrylamides with maleimides is described. This protocol displays broad functional group tolerance and high efficiency, which offers a new opportunity to access highly substituted succinimides. Dependent on the substituent positions of acrylamides and reaction conditions, olefin migrated products were obtained with high
Organic Syntheses via Transition-Metal Complexes. 119.<sup>1</sup> α-Methylenation and α-Alkenylation of α,β-Unsaturated Amides by Means of Carbene Tungsten Complexes: A Novel Baylis−Hillman Type Reaction
Fischer carbene complexes were found to undergo Baylis−Hillman type additions to α,β-unsaturated acidamides. Reactions of (non-CH-acidic) carbene tungsten complexes 1a−c with (CH-acidic) but-2-enoic acidamides 2 in the presence of POCl3/Et3N resulted in an α-addition of the carbene ligand to the amide backbone and formation of cross-conjugated aminocarbenecomplexes 3. Reaction of CH-acidic carbene
发现费歇尔卡宾络合物在α,β-不饱和酰胺中经历了Baylis-Hillman类型的加成反应。在POCl 3 / Et 3 N存在下,(非CH酸性)卡宾钨配合物1a - c与(CH酸性)丁-2-烯酰胺2的反应导致卡宾配体的α加成反应酰胺主链和交叉共轭氨基卡宾配合物的形成3。CH的反应-酸性卡宾络合物钨1D - ħ得到交叉共轭aminocarbene络合物9(其是这样的化合物的双键异构体3)与(环丁烯基)卡宾配合物10分别通过α-和β加成到丁-2-烯酰胺2上。化合物9和10是化合价异构体,但它们不会发生热互变。
Green transformation of CO<sub>2</sub> into γ-amino alcohols with continuous stereocenters
作者:Qiuxin Zhang、Heng Zhang、Senbai Geng、Xian Zhao、Shucheng Liu、Kun Hong、Jianming Pan、Xingchen Yan
DOI:10.1039/d3cc05193e
日期:——
Here, we present a synthetic route towards γ-amino alcohols with continuous stereocenters based on a copper-catalyzed asymmetric conjugate addition/CO2-trapping tandem reaction of α,β-unsaturated amide, followed by a reduction of the generated α-carboxyl amide. This strategy provides a green route for the transformation of CO2 into valuable chiral organic molecules.