coupling of ω‐allenyl‐substituted carboxylicacids. The use of a modified diop ligand, chiral DTBM‐diop, led to high enantioselectivity (up to 93 % ee). The reaction tolerated a large variety of functionalities, including α,β‐unsaturated carboxylicacids and depsipeptides, and provided the desired macrocycles with very high enantio‐ and diastereoselectivity.
Virtues of Volatility: A Facile Transesterification Approach to Boronic Acids
作者:Stefan P. A. Hinkes、Christian D. P. Klein
DOI:10.1021/acs.orglett.9b00584
日期:2019.5.3
Boronic acids are an increasingly important compound class for many applications, including C–C bond formation reactions, medicinal chemistry, and diagnostics. The deprotection of boronic ester intermediates is frequently a problematic and inefficient step in boronic acid syntheses. We describe an approach that highly facilitates this transformation by leveraging the volatility of methylboronic acid and
Palladium-catalyzed carbonylation of benzylic ammonium salts to amides and esters <i>via</i> C–N bond activation
作者:Weijie Yu、Shuwu Yang、Fei Xiong、Tianxiang Fan、Yan Feng、Yuanyuan Huang、Junkai Fu、Tao Wang
DOI:10.1039/c8ob00488a
日期:——
An efficient palladium-catalyzed carbonylation reaction of readily available quaternary ammonium salts with CO is reported for the first time to afford arylacetamides and arylacetic acid esters via benzylic C–N bond cleavage. This protocol features mild reaction conditions under atmospheric pressure of CO, a redox-neutral process without an additional oxidant, and a broad substrate scope for various
Pseudoephedrine-Directed Asymmetric α-Arylation of α-Amino Acid Derivatives
作者:Rachel C. Atkinson、Fernando Fernández-Nieto、Josep Mas Roselló、Jonathan Clayden
DOI:10.1002/anie.201502569
日期:2015.7.27
Available α‐amino acids undergo arylation at their α position in an enantioselective manner on treatment with base of N′‐aryl urea derivatives ligated to pseudoephedrine as a chiral auxiliary. In situ silylation and enolization induces diastereoselective migration of the N′‐aryl group to the α position of the amino acid, followed by ring closure to a hydantoin with concomitant explulsion of the recyclable
[EN] 2, 3, 6-TRISUBSTITUTED-4-PYRIMIDONE DERIVATIVES<br/>[FR] DERIVES DE 2,3,6-TRISUBSTITUE 4-PYRIMIDONE
申请人:MITSUBISHI PHARMA CORP
公开号:WO2004085408A1
公开(公告)日:2004-10-07
A pyrimidone derivative having tau protein kinase 1 inhibitory activity which is represented by formula (I) or a salt thereof, or a solvate thereof or a hydrate thereof; useful for prventive and/or therapeutic treatment of diseass such as neurodegenerative diseases (e.g. Alzheimer disease); wherein Q represents CH or nitrogen atom; R represents a C1-C12 alkyl group; the ring of Formula (I): represents piperazine ring or piperidine ring; each X independently represents a C1-C8 alkyl group, an optionally partially hydrogenated C6-C10 aryl ring, an indan ring or the like; m represents an integer of 1 to 3; each Y independently represents a halogen atom, a hydroxy group, a cyano group, a C1-C6 alkyl group or the like; n represents an integer of 0 to 8; when X and Y or two Y groups are attached on the same carbon atom, they may combine to each other to form a C2-C6 alkylene group.