环戊二烯基(Cp)基团是许多在催化中应用的过渡金属配合物的重要配体。手性环戊二烯基配体(Cp x)的可用性落后于其他配体类别,因此妨碍了对映选择性过程的研究。我们报告了配备手性Cp支架的手性Cp x Ir III复合物的库。强大的络合程序可为Cp x Ir III络合物可靠地提供可调节的抗衡离子。在概念验证的应用中,含碘化物对烯炔的环异构化反应具有很高的选择性。脱氢哌啶稠合的环丙烷产物以良好的产率和对映选择性形成。
Photocatalytic decarboxylative alkenylation of α-amino and α-hydroxy acid-derived redox active esters by NaI/PPh<sub>3</sub> catalysis
作者:Ya-Ting Wang、Ming-Chen Fu、Bin Zhao、Rui Shang、Yao Fu
DOI:10.1039/c9cc09654j
日期:——
Herein, we report the photocatalytic decarboxylative alkenylation reactions of N-(acyloxy)phthalimide derived from α-amino and α-hydroxy acids with 1,1-diarylethene, and with cinnamic acid derivatives through double decarboxylation, using sodium iodide and triphenylphosphine as redox catalysts. The reaction proceeds under mild irradiation conditions with visible blue light (440 nm or 456 nm) in an
Photoinduced, Copper-Promoted Regio- and Stereoselective Decarboxylative Alkylation of α,β-Unsaturated Acids with Alkyl Iodides
作者:Chao Wang、Yingjie Lei、Mengzhun Guo、Qinyu Shang、Hong Liu、Zhaoqing Xu、Rui Wang
DOI:10.1021/acs.orglett.7b03289
日期:2017.12.1
The first example of UV light-induced, copper-catalyzed regio- and stereoselective decarboxylative coupling of α,β-unsaturated acids with alkyl iodides was reported. Under standard conditions, the 1°, 2°, and 3° alkyl iodides proceeded smoothly with the E-selective alkenes obtained in uniformly good yields and high stereoselectivities.
Enantioselective Copper-Catalyzed Defluoroalkylation Using Arylboronate-Activated Alkyl Grignard Reagents
作者:Minyan Wang、Xinghui Pu、Yunfei Zhao、Panpan Wang、Zexian Li、Chendan Zhu、Zhuangzhi Shi
DOI:10.1021/jacs.8b04902
日期:2018.7.25
A copper-catalyzed system has been introduced for the enantioselective defluoroalkylation of linear 1-(trifluoromethyl)alkenes through C-F activation to synthesize various gem-difluoroalkenes as carbonyl mimics. For the first time, arylboronate-activated alkylGrignardreagents were uncovered in this cross-coupling reaction. Mechanistic studies confirmed that the tetraorganoborate complexes generated
The present invention relates to a method for the enzymatic hydroamination of C—C double bonds catalyzed by enzymes structurally and/or functionally related to phenylalanine ammonia lyase (PAL) isolated from microorganisms of
Petroselinum crispum, Rhodoturula glutinis
and/or functional active derivatives thereof.
Palladium(II)-Catalyzed Oxidative Decarboxylative [2 + 2 + 1] Annulation of Cinnamic Acids with Alkynes: Access to Polysubstituted Pentafulvenes
作者:Shiyong Peng、Nuan Chen、Hong Zhang、Min He、Hongguang Li、Ming Lang、Jian Wang
DOI:10.1021/acs.orglett.0c01955
日期:2020.7.17
An unprecedented palladium(II)-catalyzed oxidative decarboxylative [2 + 2 + 1] annulation of cinnamic acids with alkynes has been developed for the synthesis of polysubstituted pentafulvenes. Ag2CO3 and DMSO are essential for the reaction. This protocol features readily available starting materials, a wide substrate scope, and moderate to excellent yields. Moreover, various significant frameworks can
已开发出前所未有的钯(II)催化的肉桂酸与炔烃的氧化脱羧[2 + 2 +1]环合反应,用于合成多取代的五烯酮。Ag 2 CO 3和DMSO对反应至关重要。该协议的特点是容易获得的起始原料,广泛的底物范围以及中等至极好的产率。而且,可以通过氧化,还原和Scholl型反应从五烯丙基戊烯的后期转化中容易地获得各种重要的构架。