Dithiazoles and related compounds. Part 3. Preparation of 5H-1,4,2-dithiazoles via 1,3-dipolar cycloadditions between nitrile sulphides and thiocarbonyl compounds, and some conversions into 3,5-diaryl-1,4,2-dithiazolium salts
作者:Kwok-Fai Wai、Michael P. Sammes
DOI:10.1039/p19910000183
日期:——
Thermolysis of 1,3,4 -oxathiazol-2-ones 3 in the presence of thiocarbonyl compounds gives modest to good yields of the little-known 5H-1,4,2-dithiazoles 1, the reaction being successful with diaryl, aryl alkyl and dialkyl ketones, and thiono esters, but failing with dithio esters and tertiary thioamides. The influence of substituents is discussed. Solvolysis of 5-ethoxy-5H-1,4,2-dithiazoles, derived
在硫代羰基化合物的存在下,对1,3,4-氧杂噻唑-2-酮3的热解反应可得到中等程度的中等收率的鲜为人知的5 H -1,4,2-二噻唑1,该反应可成功地与二芳基,芳基烷基和二烷基酮,以及硫代酸酯,但不能与二硫代酯和叔硫代酰胺结合使用。讨论了取代基的影响。5-乙氧基-5 H -1,4,2-二噻唑类化合物,由硫代酸酯衍生,与高氯酸在乙酸酐中溶剂化,可高产率生成3,5-二芳基-1,4,2-二噻唑鎓盐9。
Quinine-catalyzed enantioselective tandem conjugate addition/intramolecular cyclization of malononitrile and 1,4-dien-3-ones
作者:Zhi-Peng Hu、Jian Li、Xiao-Gang Yin、Xue-Jing Zhang、Ming Yan
DOI:10.3998/ark.5550190.0014.301
日期:——
An organocatalytic tandemconjugateaddition / intramolecularcyclization of malononitrile and conformationally restricted 1,4-dien-3-ones has been developed. A series of cinchona alkaloids and their derivatives were examined as the catalysts. Quinine was found to be the most efficient catalyst in the absence of any additive. The reaction gave 2-amino-4H-pyrans with high yield and excellent enantiopurity
1,3-Dipolar cycloadditions of nitrile sulphides to 1,4-quinones: a route to novel isothiazolonaphthoquinones and bis-(isothiazolo)benzoquinones
作者:R. Michael Paton、John F. Ross、John Crosby
DOI:10.1039/c39800001194
日期:——
Nitrilesulphides, generated by thermolysis of 1,3,4-oxathiazol-2-ones, react with 1,4-naphthoquinone and 1,4-benzoquinone to yield the isothiazoloquinones (4)–(6).
Preparation of 5H-1,4,2-dithiazoles via 1,3-dipolar cycloadditions of nitrile sulphides to thiocarbonyl compounds; the first synthesis of a 3,5-diaryl-1,4,2-dithiazolium salt
作者:Kwok-Fai Wai、Michael P. Sammes
DOI:10.1039/c39880000852
日期:——
Nitrilesulphides from the thermal decomposition of 1,3,4-oxathiazol-2-ones add to thiocarbonyl compounds giving moderate to high yields of 5H-1,4,2-dithiazoles; an adduct from O-ethyl thiobenzoate has been converted into 3-(4-nitrophenyl)-5-phenyl-1,4,2-dithiazolium tetrafluoroborate.
来自1,3,4-恶噻唑-2-酮的热分解的腈腈加到硫代羰基化合物中,产生中等至高产率的5 H -1,4,2-二噻唑;来自硫代苯甲酸O-乙酯的加合物已转化为四氟硼酸3-(4-硝基苯基)-5-苯基-1,4,2-二噻唑鎓。
Synthesis and biological evaluation of novel isothiazoloquinoline quinone analogues
Natural quinones and their analogues have attracted growing attention because of their novel anticancer activities. A series of novel isothiazoloquinoline quinone analogues were synthesized and evaluated for antitumor activities against four different kind of cancer cells. Among them, isothiazoloquinolinoquinones inhibited cancer cells proliferation effectively with IC50 values in the nanomolar range