N-Tosyl-(S)-Prolyl Chloride in Kinetic Resolution of Racemic Heterocyclic Amines
作者:D. A. Gruzdev、S. A. Vakarov、G. L. Levit、V. P. Krasnov
DOI:10.1007/s10593-014-1432-4
日期:2014.3
The kinetic resolution of racemic heterocyclicamines via acylation with N-tosyl-(S)-prolyl chloride was systematically investigated. It was established that racemic mixtures of aromatic amines could be resolved with high efficiency, while the acylation of 2- and 3-methylpiperidines occurred with low diastereoselectivity. A method for the preparation of enantiomerically pure (3R)-7,8-difluoro-3-methyl-3
Acylative kinetic resolution of racemic heterocyclic amines with (R)-2-phenoxypropionyl chloride
作者:Sergey A. Vakarov、Dmitry A. Gruzdev、Evgeny N. Chulakov、Liliya Sh. Sadretdinova、Andrey A. Tumashov、Marina G. Pervova、Marina A. Ezhikova、Mikhail I. Kodess、Galina L. Levit、Victor P. Krasnov、Valery N. Charushin
DOI:10.1016/j.tetasy.2016.10.004
日期:2016.12
The acylative kinetic resolution of racemic heterocyclic amines such as 3,4-dihydro-3-methyl-2H-[1,4] benzoxazines, 3,4-dihydro-3-methyl-2H-[1,4]benzothiazine, 2-methyl-1,2,3,4-tetrahydro-quinolines and 2-methylindoline with enantiopure (R)-2-phenoxypropionyl chloride has been studied. It has been found that acylation of 3,4-dihydro-3-methyl-2H-[1,4]benzothiazine proceeds with the best stereoselectively when compared with other racemic amines. An efficient method for the preparation of (S)-3,4-dihydro-3-methyl-2H-[1,4]benzothiazine (99.4% ee) via a kinetic resolution protocol was developed. The possibility of recycling (R)-2-phenoxypropionic acid has been demonstrated. (C) 2016 Elsevier Ltd. All rights reserved.
Synthesis of novel purin-6-yl conjugates with heterocyclic amines linked via 6-aminohexanoyl fragment
作者:Victor P. Krasnov、Dmitry A. Gruzdev、Evgeny N. Chulakov、Alexey Yu. Vigorov、Vera V. Musiyak、Tatyana V. Matveeva、Andrey A. Tumashov、Galina L. Levit、Valery N. Charushin
DOI:10.1016/j.mencom.2015.11.003
日期:2015.11
Novel conjugates of purine and 2-aminopurine linked with heterocyclic amines, including chiral derivatives of 3,4-dihydro-2H-[1,4]benzoxazine, 3,4-dihydro-2H-[1,4]benzothiazine and 1,2,3,4-tetrahydroquinoline, by 6-aminohexanoyl fragment at the 6-position of purine moiety were obtained. For this purpose, replacement of the chlorine atom in 2-amino-6-chloropurine or 6-chloropurine by direct nucleophilic substitution reaction with 6-aminohexanamides or the coupling of 6-(purin-6-ylamino)-6-hexanoic acid with nitrogen heterocycles were used.