New total synthesis of (±)-, (−)- and (+)-chuangxinmycins
作者:Keisuke Kato、Machiko Ono、Hiroyuki Akita
DOI:10.1016/s0040-4020(01)01068-7
日期:2001.12
the (±)-(2,3)-syn-2-thioacetoxy ester 13 with retention of C2-stereochemistry in (±)-6. Palladium-catalyzed cyclization of indolyl iodide and the internal C2 thiol group of the substrate (±)-14 gave the (±)-cis methyl ester 2 of natural chuangxinmycin (1). Stereoselective total syntheses of (−)-(4S,5R)- and (+)-(4R,5S)-chuangxinmycins 1 were achieved based on the enzymatic syntheses of (2R,3S)- and (2S
A Ni(0)-catalyzed intermolecular cross-coupling of various functionalized thiols and aryl Iodides has been developed and successfully extended to less explored intramolecular versions, where thioacetates could also be utilized as the strategic surrogate. Air-stable precatalysts, very mild conditions, and an easy protocol allow rapid access to medicinally useful aryl thioethers, as demonstrated in the facile synthesis of (+/-)-chuangxinmycin as a key step.
New total synthesis of (−)- and (+)-chuangxinmycins
作者:Keisuke Kato、Machiko Ono、Hiroyuki Akita
DOI:10.1016/s0957-4166(97)00253-x
日期:1997.7
Stereoselective total syntheses of (-)-(4S,5R)- and (+)-(4R,5S)-chuangxinmycins 1 were achieved based on the enzymatic syntheses of (2R,3S)- and (2S,3R)-epoxy butanoates 8, respectively. Chiral intermediates such as (2R,3S)- and (2S,3R)-2-hydroxy-3-(4'-iodoindol-3'-yl)butanoate 5 for the chiral synthesis of (-)- and (+)-1 were also obtained by the enantioselective hydrolysis of the corresponding acetate 6 by lipase. (C) 1997 Elsevier Science Ltd.
INHIBITION OF TRNA SYNTHETASES AND THERAPEUTIC APPLICATIONS THEREOF
申请人:Whitman Malcolm
公开号:US20120058133A1
公开(公告)日:2012-03-08
The present invention provides novel methods for modulating Th 17-mediated immune responses using aminoacyl tRNA synthetase inhibitors. Inhibition of aminoacyl tRNA synthetase inhibitors activates an amino acid starvation response (AAR) and can produce beneficial therapeutic effects. In some embodiments, aminoacyl tRNA synthetase inhibitors are used to treat disorders such as autoimmune diseases, graft rejection, infections, fibrosis, and inflammatory diseases.