A selective asymmetrichydrogenation of enones has been well established by using an iridium complex composed of cheap phosphine ligands and cinchona alkaloids derivatives as catalyst. A wide range of allylic alcohol products could be obtained in high chemoselectivities (up to 99.6%), enantioselectivities (70.1% ee) and high activities (up to 3.64×104(1/h) TOF). This catalytic system opens a new way
SmI<sub>2</sub>-mediated reductive cyclization of β-arylthio ketones: a facile and diastereoselective synthesis of thiochroman derivatives
作者:Hui Mao、Bing-Xin You、Lie-Jin Zhou、Ting-Ting Xie、Yi-Hang Wen、Xin Lv、Xiao-Xia Wang
DOI:10.1039/c7ob01082f
日期:——
SmI2-mediated reductive cyclization of β-arylthio ketones to generate thiochroman derivatives is not generally observed process and the reported examples are limited to geminal disubstitution in the substrates. The results of the current study show that the cyclization also occurs when other substitution patterns are present, affording a general approach to dihydrothiochroman-ols in good yields and
Synthesis of α-Tertiary Amine Derivatives by Intermolecular Hydroamination of Unfunctionalized Alkenes with Sulfamates under Trifluoromethanesulfonic Acid Catalysis
作者:Jun Fei、Zhen Wang、Zheren Cai、Hao Sun、Xu Cheng
DOI:10.1002/adsc.201500646
日期:2015.12.14
An efficient and mild trifluoromethanesulfonic acid-catalyzed hydroamination of unfunctionalized alkenes to afford α-tertiary amine derivatives at temperatures as low as room temperature is reported. 2,2,2-Trifluoroethyl sulfamate was found to be the optimal nitrogen source because its good solubility in both organic solvents and water facilitated both conversion and purification. The reaction conditions
The first diastereoselectivesynthesis of β-amino ketone and β-amino acid derivatives by palladium-catalyzed conjugate addition of arylboronic acids to chiral β-enamino ketones and β-enamino esters is reported. The catalytic system employing (S)-4-(tert-butyl)oxazolidin-2-one as the chiral auxiliary in water under an air atmosphere provides β-amino ketone and β-amino acid derivatives in high yields
Heck Reactions of Acrolein or Enones and Aryl Bromides – Synthesis of 3‐Aryl Propenals or Propenones and Consecutive Application in Multicomponent Pyrazole Syntheses
作者:Marvin Stephan、Jesco Panther、Fabio Wilbert、Pauline Ozog、Thomas J. J. Müller
DOI:10.1002/ejoc.202000066
日期:2020.4.16
The Heck reaction of (hetero)aryl bromides and acrolein or vinyl ketones using CataCXium® Ptb as a ligand, NaHCO3 as a base, and nBu4NCl provides an efficient access to 3‐(hetero)aryl propenals/propenones, which are directly employed in consecutive multicomponent syntheses of pyrazoles in a one‐pot fashion.
使用CataCXium®Ptb作为配体,NaHCO 3作为碱和n Bu 4 NCl进行(杂)芳基溴化物和丙烯醛或乙烯基酮的Heck反应,可以有效地获得3-(杂)芳基丙烯/丙烯酮。以单罐方式直接用于吡唑的连续多组分合成中。