A Novel Synthesis of Chiral Guanidinium Receptors and Their Use in Unfolding the Energetics of Enantiorecognition of Chiral Carboxylates
作者:Vinod D. Jadhav、Franz P. Schmidtchen
DOI:10.1021/jo7021026
日期:2008.2.1
A novel synthetic route to the versatile chiral bicyclic guanidinium building block is described making use of l-methionine as a starting material from the natural chiral pool. Furthermore, the synthetic elaboration of this building block is shown in the construction of macrocyclic and open chain hosts, respectively. The host design employs urea functions as the connecting units and supplementary anchor
A Convenient Access to Chiral Monofunctionalized Bicyclic Guanidinium Receptor Groups
作者:A. Metzger、W. Peschke、F. P. Schmidtchen
DOI:10.1055/s-1995-3953
日期:1995.5
An easy and high-yield route for the preparation of functional and chiral hexahydropyrimido[1,2-a]pyrimidines 3 is described. Starting from known methioninol and 2-methylmercaptotetrahydropyrimidine 5, the target compounds, which may be useful as building blocks in the synthesis of polymodular molecular hosts, were obtained in over 50% total yield. As an example the iodo compound 20 was converted into the homoarginine analog 22 in 70% yield.