in solution phase are described. These syntheses have been successfully achieved by applying the 'azirine/oxazolone method' to introduce the two Aib-Pro units into the backbone of these undecapeptaibols in one step with methyl 2,2-dimethyl-2H-azirine-3-prolinate as the 'Aib-Prosynthon'. The coupling of Z-protected (Z=(benzyloxy)carbonyl) amino acids or peptide acids with amino acid tert-butyl esters
N-amination of amino acids and its derivatives using N-Boc-O-tosyl hydroxylamine as an efficient NH-Boc transfer reagent: electrophilic amination
作者:Thankappan Baburaj、Sivalingam Thambidurai
DOI:10.1016/j.tetlet.2012.02.075
日期:2012.5
biologically active heterocyclic derivatives, were synthesized by electrophilic amination methodology using N-Boc-O-tosyl hydroxylamine as an efficient NH-Boc transfer reagent. Also, we have demonstrated the conversion of other amino acid derivatives such as amino esters and amino alcohols into β-Boc-hydrazino derivatives using this reagent.
Renin inhibitors. Dipeptide analogs of angiotensinogen utilizing a dihydroxyethylene transition-state mimic at the scissile bond to impart greater inhibitory potency
作者:Jay R. Luly、Nwe BaMaung、Jeff Soderquist、Anthony K. L. Fung、Herman Stein、Hollis D. Kleinert、Patrick A. Marcotte、David A. Egan、Barbara Bopp
DOI:10.1021/jm00120a005
日期:1988.12
extremely selective for human renin over the related enzymes cathepsin D, pepsin, and gastricsin. At high concentrations, compounds containing a leucine or phenylalanine rather than a histidine at the P2 position gave only minor amounts of inhibition of the other enzymes. Inhibitor 43 suppressed plasma renin activity completely and lowered mean bloodpressure in monkeys after both intravenous and intraduodenal
Disclosed, as a γ-secretase inhibitor, is a compound consisting of an amino acid sequence which consists of at least three consecutive amino acids of the amino acid sequence Val-Val-Ile-Ala-Thr-Val-Ile-Val-Ile-Thr-Leu-Val-Met-Leu-Lys-Lys including Leu at position 11, wherein, between the Leu and one or both amino acids located immediately before or after it, the peptide bond, —CO—NH—, is replaced with a hydroxyethylene group, —CHOH—CH
2
—, wherein the N terminus has an alkyloxycarbonyl group based on C1-10 alkyl that may carry phenyl or naphthyl as a substituent group, wherein the C terminus is converted to alkyl ester or alkyl amide based on C1-10 alkyl that may carry phenyl or naphthyl as a substituent group, and wherein the hydrogen atom of the hydroxyl group of the Thr at position 10 may be replaced with a C1-4 hydrophobic group or a Z group, or a pharmaceutically acceptable salt thereof.