Aqueous phase semihydrogenation of alkynes over Ni–Fe bimetallic catalysts
作者:Rohit K. Rai、Mahendra K. Awasthi、Vipin K. Singh、Sudipta Roy Barman、Silke Behrens、Sanjay K. Singh
DOI:10.1039/d0cy01153c
日期:——
Bimetallic Ni–Fe catalysts (Ni/Fe, 1 : 1, 1 : 3, and 3 : 1) are synthesized and explored for their catalytic activity in semihydrogenation of internal alkynes using H2 gas in water–ethanol solution.
Regioselective Dihalohydration Reactions of Propargylic Alcohols: Gold-Catalyzed and Noncatalyzed Reactions
作者:Jarryl M. D'Oyley、Abil E. Aliev、Tom D. Sheppard
DOI:10.1002/anie.201405348
日期:2014.9.26
The regioselective conversion of propargylicalcohols into previously unreported α,α‐diiodo‐β‐hydroxyketones was achieved by treatment with N‐iodosuccinimide in the presence of a gold catalyst. The corresponding α,α‐dichloro‐β‐hydroxyketones were obtained by treatment with trichloroisocyanuric acid in the absence of a catalyst. The latter reaction can be extended to other alkynols. These transformations
The present invention provides a heterocycle derivative having a superior amyloid β production inhibitory activity and/or a superior γ-secretase modulation activity, and use thereof. A compound represented by the formula (I):
wherein each symbol is as defined in the present specification, or a salt thereof.
cross-coupling reaction of arylhalides with a variety of terminal alkynes under amine-free conditions in dimethylformamide (DMF) at 80 °C gave internal arylated alkynes using PdCl2(MeCN)2 with phosphine-free hydrazone 2a as a ligand and CuI as the cocatalyst in good yields. We also found PdCl2/hydrazone ligand 1d in PhMe at 80 °C was a phosphine-free efficient catalyst system for a Hiyama cross-coupling
Synthesis of Quinolinium Salts from <i>N</i>
-Substituted Anilines, Aldehydes, Alkynes, and Acids: Theoretical Understanding of the Mechanism and Regioselectivity
A3 reaction with secondary aniline: Secondary anilines were first utilized in coupling with aldehydes and alkynes to synthesize corresponding N‐substituted quinolinium salts. DFT calculation was performed to understand the [4+2] cycloaddition mechanism and the singular regioselectivity of the reaction.