Samarium-based Grignard-type addition of organohalides to carbonyl compounds under catalysis of CuI
作者:Shuhuan Xiao、Chen Liu、Bin Song、Liang Wang、Yan Qi、Yongjun Liu
DOI:10.1039/d1cc00965f
日期:——
Grignard-type additions were readily achieved under the mediation of CuI (10 mol%) and samarium (2 equiv.) by employing various organohalides, e.g. benzyl, aryl, heterocyclic and aliphatic halides (Cl, Br or I), and diverse carbonylcompounds (e.g. carbonic esters, carboxylic esters, acid anhydrides, acyl chlorides, ketones, aldehydes, propylene epoxides and formamides) to afford alcohols, ketones
Stereoselective Synthesis of δ-Lactones from 5-Oxoalkanals via One-Pot Sequential Acetalization, Tishchenko Reaction, and Lactonization by Cooperative Catalysis of Samarium Ion and Mercaptan
作者:Jue-Liang Hsu、Jim-Min Fang
DOI:10.1021/jo016058t
日期:2001.12.1
sequence of acetalization, Tishchenko reaction and lactonization. The deliberative use of mercaptan, by comparison with alcohol, is advantageous to facilitate the catalytic cycle. The reaction mechanism and stereochemistry are proposed and supported by some experimental evidence. Such samarium ion/mercaptan cocatalyzed reactions show the feature of remote control, which is applicable to the asymmetric synthesis
Iron-Catalyzed Nucleophilic Addition Reaction of Organic Carbanion Equivalents via Hydrazones
作者:Chen-Chen Li、Xi-Jie Dai、Haining Wang、Dianhu Zhu、Jian Gao、Chao-Jun Li
DOI:10.1021/acs.orglett.8b01391
日期:2018.7.6
Earth-abundant and well-defined iron complexes are found to be cheap and effective catalysts for a series of “umpolung” nucleophilic additions of hydrazones. The new catalytic system not only maintains the broad substrate scope of an earlier expensive ruthenium system but also attains chemoselectivity of different kinds of carbonylgroups. Furthermore, the iron catalyst enables this reaction at ambient
A kineticresolution of racemic 2-substituted cyclopentanones via highly regio- and enantioselective Baeyer–Villiger oxidation has been successfully developed. The reaction could afford the normal 6-substituted δ-lactones in up to 98% ee and >19/1 regioselectivity. Meanwhile, the unreacted ketones were recovered in excellent ee values (up to 98%). It represents the best results of the kinetic resolution
Potent and selective P2–P3 ketoamide inhibitors of cathepsin K with good pharmacokinetic properties via favorable P1′, P1, and/or P3 substitutions
作者:David G. Barrett、John G. Catalano、David N. Deaton、Anne M. Hassell、Stacey T. Long、Aaron B. Miller、Larry R. Miller、Lisa M. Shewchuk、Kevin J. Wells-Knecht、Derril H. Willard、Lois L. Wright
DOI:10.1016/j.bmcl.2004.07.031
日期:2004.10
A series of ketoamides were synthesized and evaluated for inhibitory activity against cathepsin K. Exploration of the interactions between achiral P(2) substituents and the cysteine protease based on molecular modelling suggestions resulted in potent cathepsin K inhibitors that demonstrated highselectivity versus cathepsins B, H, and L. Subsequent modifications of the P(3), P(1), and P(1') moieties