Reported here is an asymmetric CH functionalization approach to β‐lactams using readily accessible chloroacetamide substrates. Important aspects of this transformation are challenging C(sp3)C(sp3) and strain‐building reductive eliminations to for the four‐membered ring. In general, the β‐lactams are formed in excellent yields and enantioselectivities using a bulky taddolphosphoramidite ligand in combination
Ruthenium catalysed N-alkylation of amines with alcohols
作者:Malai Haniti S. A. Hamid、Jonathan M. J. Williams
DOI:10.1039/b616859k
日期:——
The conversion of primary amines into secondary amines has been achieved using alcohols as the alkylating agent, catalysed by [Ru(p-cymene)Cl2]2 and a bidentate phosphine ligand.
The intramolecular carbene C–H insertion of α-diazo-α(methoxycarbonyl)acetamides leading to β-lactams is effectively catalyzed by palladiumcomplexes. It is found that whereas Pd(0)catalysts typically produce mixtures of β-lactams together with Buchner-type reaction products, the use of Pd(II)-catalysts results in highly chemoselective transformations. According to DFT calculations, this insertion reaction
The present invention relates to novel lipopeptide compounds. The invention also relates to pharmaceutical compositions of these compounds and methods of using these compounds as antibacterial compounds. The invention also relates to methods of producing these novel lipopeptide compounds and intermediates used in producing these compounds.