Mechanism of dehydration of 2-CH2R-and 2-CHR2-4-hydroxy-Δ2-thiazolines as intermediates in the Hantzsch thiazole synthesis and factors impeding the synthesis of 2-Me-, 2-Ar-, and 2-Het-substituted thiazoles and thiazolo[5,4-b]indoles
作者:A. Yu. Lepeshkin、K. F. Turchin、E. G. Gal’pern、I. V. Stankevich、K. A. Lyssenko、V. S. Velezheva
DOI:10.1007/s11172-007-0220-z
日期:2007.7
formation of the corresponding Δ3-thiazolines. According to the results of quantum chemical calculations, this is energetically more favorable than the dehydration in terms of the commonly accepted mechanism. In some cases, an acidic medium impedes the dehydration of 4-hydroxy-Δ2-thiazolines or their cyclic analogs. The proposed mechanism provides an explanation for the empirical data on the differences in
Lawesson's reagent promoted deoxygenation of azlactones for the syntheses of 2,4-disubstituted thiazoles
作者:Gaofeng Yin、Xiaodong Wang、Yuqing Wang、Tao Shi、Yaofu Zeng、Yuying Wang、Xue Peng、Zhen Wang
DOI:10.1039/d2ob01939f
日期:——
Azlactones and thiazoles are common structural motifs and possess diverse applications. A new method for the efficient and straightforward syntheses of 2,4-disubstituted thiazoles from azlactones has been developed. The reaction proceeded via deoxygenation of azlactones by Lawesson's reagent without metal or external additives. A variety of 2,4-disubstituted thiazoles were synthesized with up to 92%
Methods and Compositions for the Treatment of RAS Associated Disorders
申请人:Ratner Nancy
公开号:US20120302581A1
公开(公告)日:2012-11-29
The instant disclosure relates to compositions that may be useful as therapeutic agents for the treatment of disorders associated or caused by Ras deregulation or dysregulation, for example, disorders associated with alterations in the NF1 gene such as neurofibromatosis type I, fungal infections such as those caused by
Candida albicans
, and proliferative disorders such as glioblastoma.
US7294640B2
申请人:——
公开号:US7294640B2
公开(公告)日:2007-11-13
Chemotherapy of Tuberculosis, Part IX: Synthesis and Screening of New Thiazolyl Thiocarbanilides
Nearly eighty substituted thiocarbanilides–viz., p -(2-thiazolyl)-, p -(4-thiazolyl)- and p -(5-thiazolyl)- p -alkoxy-thiocarbanilides, and p - p ′-bis(4-thiazolyl)-thiocarbanilides, along with a few thiazolyl thiocarbanilides having halogens on the phenyl ring containing the p ′-alkoxy group, have been synthesized and studied for in vitro antitubercular activity. Also described are over 40 new substituted