An improved solid-phase methodology for the synthesis of putative hexa- and heptapeptide intermediates in vancomycin biosynthesis
作者:Dong Bo Li、John A. Robinson
DOI:10.1039/b418908f
日期:——
The biosynthesis of the vancomycin aglycone involves three oxidativephenolcouplingreactions, each catalyzed by a discrete cytochrome P450-like enzyme. Studies on the mechanism and specificity of the enzyme (called OxyB) catalyzing the first coupling, require access to suitable linear peptide precursors, each conjugated as a thioester to a peptide carrier domain of the vancomycin non-ribosomal peptide
Steric hindrance is a key factor in the coupling reaction of (acyloxy) alkyl-α-halides with phenols to make a new promoiety for prodrugs
作者:Hui Ouyang、Ronald T Borchardt、Teruna J Siahaan
DOI:10.1016/s0040-4039(01)02241-9
日期:2002.1
(Acyloxy) alkyl-α-halides were conjugated with phenols in acetone in the presence of cesium carbonate to give (acyloxy) alkyl-α-ethers of phenols. Sterichindrance is a key factor governing this reaction and greater sterichindrance favors the alkylation product over the acylation product.