Pd-Catalysed oxidative carbonylation of α-amino amides to hydantoins under mild conditions
作者:Aleksandr Voronov、Vinayak Botla、Luca Montanari、Carla Carfagna、Raffaella Mancuso、Bartolo Gabriele、Giovanni Maestri、Elena Motti、Nicola Della Ca
DOI:10.1039/d1cc04154a
日期:——
The first example of palladium-catalysed oxidative carbonylation of unprotected α-amino amides to hydantoins is described here. The selective synthesis of the target compounds was achieved undermildconditions (1 atm of CO), without ligands and bases. The catalytic system overrode the common reaction pathway that usually leads instead to the formation of symmetrical ureas.
Synthesis of Highly Substituted Imidazolidine-2,4-dione (Hydantoin) through Tf<sub>2</sub>O-Mediated Dual Activation of Boc-Protected Dipeptidyl Compounds
作者:Hui Liu、Zhimin Yang、Zhengying Pan
DOI:10.1021/ol502900j
日期:2014.11.21
Highly substituted chiral hydantoins were readily synthesized from simple dipeptides in a single step under mild conditions. This reaction proceeded through the dual activation of an amide and a tert-butyloxycarbonyl (Boc) protecting group by Tf2O-pyridine. This method was successfully applied in the preparation of a variety of biologically active compounds, including drug analogs and natural products
Treatment of N-(4-nitrophenoxycarbonyl)amino acid amide, which was prepared from amino acid amide and 4-nitrophenyl chloroformate, under weakly basic conditions proceeded to afford the corresponding hydantoin. A direct conversion of amino acid amide into hydantoin without isolation of N-(4-nitophenoxycarbonyl)amino acid amide was also accomplished.
Access to combinatorial chemistry of hydantoins is provided by convenient and versatile methods for the solidphasesynthesis of libraries of 3,5-, 1,3- and 1,3,5-substituted hydantoins. The preparation of trisubstituted hydantoins features a Mitsunobu reaction for introduction of the substituent on N-1.
Enantioselective synthesis of 3,5-disubstituted thiohydantoins and hydantoins
作者:Yu Chen、Li Su、Xinying Yang、Wenyan Pan、Hao Fang
DOI:10.1016/j.tet.2015.10.041
日期:2015.12
A mild method to convert optically pure amino acid thiourea and urea derivatives to thiohydantoins and hydantoins, respectively, is described. It provides an efficient way to realize enantioselective synthesis of thiohydantoins and hydantoins with good to high isolated yields and enantiomeric purities. We found that the enantiomeric purities were highly dependent on the reaction conditions including bases, solvents, and temperature. (C) 2015 Elsevier Ltd. All rights reserved.