Aryl Acetylenes as Mechanism-Based Inhibitors of Cytochrome P450-Dependent Monooxygenase Enzymes
作者:Maryam Foroozesh、Ginny Primrose、Zuyu Guo、L. Chastine Bell、William L. Alworth、F. Peter Guengerich
DOI:10.1021/tx960064g
日期:1997.1.1
methylene groups are selective inhibitors of P450 2B1/2B2 in liver microsomes from rats. Aryl acetylenes also act as suicide inhibitors of P450 1A2 in human liver microsomes, of purified P450 1A2 from rabbit or rat liver in reconstituted systems, and of purified recombinant human P450 1A2 and 1A1 in reconstituted systems. 4-(1-Propynyl)biphenyl (4PBi) inactivated P450 1A2-dependent ethoxyresourfin deethylation
Copper(<scp>ii</scp>)-catalyzed highly regio- and stereo-selective hydrosilylation of unactivated internal alkynes with silylborate in water
作者:Qing-Qing Xuan、Chuan-Li Ren、Li Liu、Dong Wang、Chao-Jun Li
DOI:10.1039/c5ob00694e
日期:——
The highlyregio- and stereoselectivehydrosilylation of internal alkynes with silylborate catalyzed by Cu(OTf)2 with 1,10-phenanthroline as the ligand in the presence of Cs2CO3 in water is developed. This protocol was applied efficiently in the aqueous synthesis of multi-substituted vinylsilanes.
在水中存在Cs 2 CO 3的情况下,开发了以1,10-菲咯啉为配体的Cu(OTf)2催化内部炔烃与甲硅烷基硼酸酯的高度区域选择性和立体选择性氢化硅烷化反应。该方案有效地应用于多取代乙烯基硅烷的水合成中。
Direct Enantioselective α-Allylation of Unfunctionalized Cyclic Ketones with Alkynes through Pd-Amine Cooperative Catalysis
作者:Jin Tu Danence Lee、Yu Zhao
DOI:10.1002/chem.201802273
日期:2018.7.5
in good to high enantiopurity. In this transformation, a chiral palladium complex containing the (S)‐DIFLUORPHOS ligand catalyzes the isomerization of alkynes into an electrophilic allylpalladium species, which is attacked by the enamine generated in situ from the condensation of (R)‐prolinol with the ketone substrate.
The metal-mediated propargylation or allenylation of carbonyl compounds is well-adapted to the preparation of homopropargylic or allenylic alcohols, which are multifunctional intermediates in synthetic chemistry. However, the regioselectivity of reactions using propargyl or allenyl metal reagents is difficult to control, owing to the equilibrium between the two species. In our study, propargyl or allenyl