Benzotriazole-Mediated Synthesis of Aza-peptides: En Route to an Aza-Leuenkephalin Analogue
作者:Nader E. Abo-Dya、Suvendu Biswas、Akash Basak、Ilker Avan、Khalid A. Alamry、Alan R. Katritzky
DOI:10.1021/jo302251e
日期:2013.4.19
with an ester bond 26b, and a hybrid azatripeptide with an ester bond 28. A new protocol for the synthesis of N-Pg-azatripeptides 33a,b and 35a,b, each containing a natural amino acid at the N-terminus, avoids the low coupling rates of the aza-amino acid residue and enables the solution-phase synthesis of an azaphenylalanine analogue of Leu-enkephalin 40.
Synthesis of Highly Substituted 1,2-Diazetidin-3-ones, Small-Ring Scaffolds for Drug Discovery
作者:Marilia S. Santos、Andrew Nortcliffe、William Lewis、Tracey D. Bradshaw、Christopher J. Moody
DOI:10.1002/chem.201801309
日期:2018.6.12
readily accessible, small ring scaffolds that upon functionalization have the potential to produce diverse 3‐dimensional structures for drug discovery. Thus, treatment of diazo hydrazides, obtained from simple hydrazides and malonyl half ester derivatives, followed by diazo transfer, with catalytic amounts of rhodium(II) acetate dimer results in intramolecular carbenoid N−H insertion to give 1,2‐diazetidin‐3‐ones
difficulty in synthesizing such peptide analogues, as illustrated by the synthesis of tripeptide derivatives containing two consecutive aza-amino acids. Herein, we report some general guidelines regarding the activation and the coupling of alkyl-hydrazides either mutually or with a natural amino acid, taking into account their nucleophilicity and the nature of their side chains.
Synthesis of Macrocycles Derived from Substituted Triazines
作者:Akop Yepremyan、Arshad Mehmood、Parham Asgari、Benjamin G. Janesko、Eric E. Simanek
DOI:10.1002/cbic.201800475
日期:2019.1.18
Bicycle made from two: Condensation of a small molecule bearing an aldehyde and hydrazine group leads to macrocycles, specifically dimers, in excellent yields. The design rests on a substituted [1,3,5]‐triazine that affords multiple sites for the incorporation of structural diversity.
Mn(III)-mediated phosphinoylation of aldehyde hydrazones: Direct “one-pot” synthesis of α-iminophosphine oxides from aldehydes
作者:Xue-Wei Bian、Ling Zhang、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2021.132053
日期:2021.4
A “one-pot” strategy for the straightforward Mn(III)-mediated phosphinoylation of aldehyde hydrazones with diphenylphosphine oxide to furnish α-iminophosphine oxides is described. This mild and practical method allows the direct use of aldehydes as substrates in one pot to generate the hydrazones, which are then engaged “in situ” by the phosphorus reagent in the presence of Mn(OAc)3 oxidant. Thus,