Microwave-Assisted Synthesis and Antituberculosis Screening of Some 4-((3-(Trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-<i>a</i>
]pyrazin-7(8<i>H</i>
)-l)methyl)benzenamine Hybrids
作者:Yogesh Patil、Ramesh Shingare、Amit Choudhari、Dhiman Sarkar、Balaji Madje
DOI:10.1002/jhet.3416
日期:2019.2
In the present investigation, a series of 4‐((3‐(trifluoromethyl)‐5,6‐dihydro‐[1,2,4]triazolo[4,3‐a]pyrazin‐7(8H)‐yl)methyl)benzenamine analogs 6a–o were synthesized and characterized by IR, NMR (1H and 13C), and mass spectra. All newly synthesized compounds 6a–o were prepared under conventional and microwave irradiation methods. These compounds obtained in higher yields and in shorter reaction times
Our previous studies showed that the natural compound berbamine, from Chinese herb Berberis amurensis, selectively induces apoptosis of imatinib (IM)-resistant-Bcr/Abl-expressing leukemia cells from the K562 cell line and CML patients. Here, a series of newberbamine derivatives were obtained by synthesis. In this series, high to very high activity in vitro has been found. Compounds 2e, 2g, 3f, 3k
PROCESS FOR PREPARATION OF (2R)-4-OXO-4-[3- (TRIFLUOROMETHYL)-5,6-DIHYDRO [1,2,4]-TRIAZOLO[4,3-A]PYRAZIN- 7(8H)-YL]-L-(2,4,5-TRIFLUOROPHENYL)BUTAN-2-AMINE & NEW IMPURITIES IN PREPARATION THEREOF
申请人:Kothari Himanshu Madhusudan
公开号:US20110213149A1
公开(公告)日:2011-09-01
The present invention relates to synthesis of β-amino acid derivatives of formula (I) and its salts of formula (Ia) by a novel process. The process comprises the reduction of a protected or unprotected prochiral β-amino acrylic acid or derivative there of, by using borane containing reducing agents at atmospheric pressure. The resulting racemic β-amino compound is resolved to a pure stereoisomer of formula (I), specifically to (2R)-4-oxo-4-[3-Ctrifluoromethyl)-5,6-dihydrol[1,2,4]triazolo[4,3-alpyrazin-7(8H)-yl]-1-(2,4,4-trifluorophenyl)butan-2-amine. In an embodiment the invention disclosed polymorphic forms of formula (I), phosphate salt of formula (I) and also a Dibenzoyl-L-tartaric acid salt of formula (I).