first homogeneously catalyzed diaminations of primary and secondary diols with ammonia give the corresponding diamines. Other primary as well as secondary alcohols including hydroxy‐substituted esters can also be efficiently converted to primary amines. This atom‐efficient and selective amination method proceeds in an ammonia atmosphere without additional hydrogen sources.
A slightly adapted catalyst system has been successfully applied in the directamination of primary and secondaryalcohols. Moreover, the applicability to diols has been shown, giving high selectivity towards the primary diamines. It was found that the Ru/P ratio as well as the amount of ammoniaused are highly important in this system, especially for higher substrate loadings. The catalyst was employed
aromatic carboxylic acids. The extension of the scope of the reaction to eight Boc-protected amino acids is also described, the products being obtained in moderate to good yields. A preliminary screening of these new potential organocatalysts was carried out for the aldolization of isatin.
Discovery of a new isomannide-based peptidomimetic synthetized by Ugi multicomponent reaction as human tissue kallikrein 1 inhibitor
作者:Thalita G. Barros、Jorge A.N. Santos、Bruno E.G. de Souza、Ana Carolina R. Sodero、Alessandra M.T. de Souza、Dayane P. da Silva、Carlos Rangel Rodrigues、Sergio Pinheiro、Luiza R.S. Dias、Bárbara Abrahim-Vieira、Luciano Puzer、Estela M.F. Muri
DOI:10.1016/j.bmcl.2016.11.051
日期:2017.1
Human kallikrein 1 (KLK1) is the most extensively studied member of this family and plays a major role in inflammation processes. From Ugi multicomponent reactions, isomannide-based peptidomimetic 10 and 13 where synthesized and showed low micromolar values of IC50 for KLK1 The most active compound (10) presented competitive mechanism, with three structural modifications important to interact with
Renewable Rigid Diamines: Efficient, Stereospecific Synthesis of High Purity Isohexide Diamines
作者:Shanmugam Thiyagarajan、Linda Gootjes、Willem Vogelzang、Jacco van Haveren、Martin Lutz、Daan S. van Es
DOI:10.1002/cssc.201100398
日期:2011.12.16
We report an efficient three‐step strategy for synthesizing rigid, chiral isohexidediamines derived from 1,4:3,6‐dianhydrohexitols. These biobased chiral building blocks are presently the subject of several investigations (in our and several other groups) because of their application in high‐performance biobased polymers, such as polyamides and polyurethanes. Among the three possible stereo‐isomers