Synthesis and antiviral evaluation of 2′,3′-dideoxy-2′,3′-difluoro-D-arabinofuranosyl 2,6-disubstituted purine nucleosides
作者:Raymond F. Schinazi、Grigorii G. Sivets、Mervi A. Detorio、Tami R. McBrayer、Tony Whitaker、Steven J. Coats、Franck Amblard
DOI:10.1515/hc-2015-0174
日期:2015.10.1
Abstract The synthesis of new 2,6-disubstituted purine 2′,3′-dideoxy-2′,3′-difluoro-D-arabino nucleosides is reported. Their ability to block HIV and HCV replication along with their cytotoxicity toward Huh-7 cells, human lymphocyte, CEM and Vero cells was also assessed. Among them, β-2,6-diaminopurine nucleoside 25 and guanosine derivative 27 demonstrate potent anti-HIV-1 activity (EC50 = 0.56 and
Synthesis of 9-(2,3-Dideoxy-2,3-Difluoro-β-D- Arabinofuranosyl)Adenine
作者:Grigorii G. Sivets、Elena N. Kalinichenko、Igor A. Mikhailopulo
DOI:10.1080/15257770701534063
日期:2007.11.26
Convergent synthesis of 9-(2,3-dideoxy-2,3-difluoro-beta-D-arabinofuranosyl)adenine is described starting from methyl 5-O-benzyl-2-deoxy-2-fluoro-alpha-D-arabinofuranoside.
The reaction of (diethylamino)sulfur trifluoride (DAST) with methyl 5-O-benzoyl-beta-D-xylofuranoside (1) followed by column chromatography afforded the riboside 2 (62%) and the ribo-epoxide 3 (18%) (Scheme 1). Under similar reaction conditions, the alpha-D-anomer 4 gave the riboside 5 and the difluoride 6 in 60 and 9% yield, respectively Treatment of the beta-D-xyloside 10 with DAST gave, after chromatographic purification, the riboside 11 as the principal product (48% 1 Scheme 2). These results suggest that the C(3)-O-SF2NEt2 derivatives were initially formed in the case of the xylosides studied. The distinctive feature of the reaction of DAST with the beta-D-arabinoside 12 consists in the formation of a 3- or 5-benzylideneoxoniumyl-substituted intermediate on one of the consecutive transformations, which finally give rise to the inversion of the configuration at C(3) affording the xylosides 17 (18%) and 18 (55% ): the lyxoside 14 was also isolated from the reaction mixture in a yield of 25% (Scheme 3). In the presence of the non-participating 5-O-trityl group, i.e.,from the reaction products of 21 with DAST. the compounds 23 and 23 were isolated in 16 and 52% yield, respectively (Scheme 4). It may be thus reasonable to conclude that, in the case of the beta-D-arabinosides 12 and 21, the principal route of the reaction is the formation of the intermediate C(2)-O-SF2NEt2 derivative. Unlike the alpha-D-arabinoside 26 was converted to the lyxo-epoxide 25 (53%) and the lyxoside 27 (14%), which implies the intermediate formation of the C(3)-O-SF2NEt2 derivative (Scheme 5).
A Novel Route for the Synthesis of Fluorodeoxy Sugars and Nucleosides
作者:Igor A. Mikhailopulo、Grigorii G. Sivets、Natalia B. Khripach
DOI:10.1080/15257779908041542
日期:1999.4
Ring-fluorination of alpha- and beta-D-pentofuranosides containing free secondary hydroxyl groups by (diethylamino)sulfur trifluoride (DAST) was studied.
PREPARATION AND METHODS OF USE FOR ORTHO-ARYL 5-MEMBERED HETEROARYL-CARBOXAMIDE CONTAINING MULTI-TARGETED KINASE INHIBITORS
申请人:Spacefill Enterprises LLC
公开号:US20160303128A1
公开(公告)日:2016-10-20
The present disclosure relates to compounds of the Formula (I):
and pharmaceutically acceptable salts, as kinase modulators, compatible with the Type-II inhibition of kinases.