Sterically Demanding Oxidative Amidation of α-Substituted Malononitriles with Amines Using O<sub>2</sub>
作者:Jing Li、Martin J. Lear、Yujiro Hayashi
DOI:10.1002/anie.201603399
日期:2016.7.25
An efficient amidation method between readily available 1,1-dicyanoalkanes and either chiral or nonchiral amines was realized simply with molecular oxygen and a carbonate base. This oxidative protocol can be applied to both sterically and electronically challenging substrates in a highly chemoselective, practical, and rapid manner. The use of cyclopropyl and thioether substrates support the radical
Efficient and selective hydrogenation of C–O bonds with a simple sodium formate catalyzed by nickel
作者:Xiaoxiang Xi、Tieqiao Chen、Ji-Shu Zhang、Li-Biao Han
DOI:10.1039/c7cc08709h
日期:——
A Ni-catalyzed hydrogenation of C–O compounds with sodium formate is developed. Various esters, i.e. aryl, alkenyl, benzyl pivalates, and even the arylethers, were efficiently reduced with a loading of nickel catalysts down to 0.5 mol%. Reactive functional groups such as C–C double bonds, carbonyl, CN, MeS and halogen groups are tolerable. This reaction can be used for the modification of complex
Hybrid P-chiral diphosphines for asymmetric hydrogenation
作者:Duncan Carmichael、Henri Doucet、John M. Brown
DOI:10.1039/a808711c
日期:——
A family of diphosphine ligands has been prepared by Michael addition of o-anisylphenyl phosphide to diethyl vinylphosphonate and elaboration to phospholanes based on hexane-2,5-diol or mannitol; some preliminary results of Rh-complex catalysed hydrogenations are reported.
Synthesis of peptide oxazolones and related compounds
作者:W.J. McGahren、M. Goodman
DOI:10.1016/0040-4020(67)80036-x
日期:1967.5
2-(1′-benzyloxycarbonylamino-1′-methyl)ethyl-4-methyl-oxazolone and 2-(1′-benzyloxycarbonylamino-1′-methyl)ethyl-4-benzyloxazolone, were prepared and characterized. the imidazole-acceleratedp-nitrophenyl-active ester synthesis was found to be a good route to the dipeptides benzyloxycarbonylaminoisobutyryl-l-phenylalanine methyl ester and benzyloxycarbonylaminoisobutyryl-l-alanine methyl ester. The acids were
FACILE AMIDE FORMATION VIA S-NITROSO THIOACID INTERMEDIATES
申请人:Xian Ming
公开号:US20120190820A1
公开(公告)日:2012-07-26
Provided are methods for forming a reactive S-nitroso thioacid (NTA), comprising nitrosation of a thioacid with a nitrosation reagent. Also provided are methods for: acylating a nucleophile including selective acylation with a high degree of selectivity toward amines over hydroxyls; amide or peptide bond formation; forming a dipeptide or polypeptide; and peptide coupling/ligation, comprising use of thioacid and amine starting materials, wherein the reactions are mediated by very reactive S-nitroso thioacid (NTA) intermediates enabling extremely fast reactions under mild conditions, providing for broad applications.