Imidazo[1,2-b]pyridazines. XXIII Some 5-Deaza Analogues. Syntheses of Some 2-Aryl-6-(chloro, methoxy or unsubstituted)-3- (variously substituted)imidazo[1,2-a]pyridines and Their Affinity for Central and Mitochondrial Benzodiazepine Receptor
Imidazo[1,2-b]pyridazines. XXIII Some 5-Deaza Analogues. Syntheses of Some 2-Aryl-6-(chloro, methoxy or unsubstituted)-3- (variously substituted)imidazo[1,2-a]pyridines and Their Affinity for Central and Mitochondrial Benzodiazepine Receptor
found to be effective alkyl radical sources for direct alkyl sulfuration with imidazopyridines using elementalsulfur under metal-free conditions. Iodine, an inexpensive and mild reagent, could promote alkyl sulfuration. A variety of quaternary cyanoalkyl radicals were successfully coupled with elementalsulfur. A subsequent C–H sulfuration of imidazopyridines afforded a diverse array of imidazopyridine
The combination of elemental sulfur and carbamoyl chloride was found to act as a carbamothioyl group surrogate for direct thiocarbamation of imidazopyridines in the absence of a metal catalyst.
A transition-metal-free sulfite-promoted three-component C–H sulfuration between imidazoheterocycles, elementalsulfur, and bromofluoroacetate is developed. Sulfites, including Na2S2O4, NaHSO3, and Na2S2O3, are able to promote the formation of two C–S bonds in one step using elementalsulfur as a green sulfurating agent, allowing the rapid introduction of the synthetically useful S-fluoroacetate group
开发了一种在咪唑杂环,元素硫和溴氟乙酸盐之间的无过渡金属的亚硫酸盐促进的三组分C–H硫化反应。亚硫酸盐,包括Na 2 S 2 O 4,NaHSO 3和Na 2 S 2 O 3,能够使用元素硫作为绿色硫化剂,一步一步促进两个C–S键的形成,从而可以快速引入将合成上有用的S-氟乙酸酯基转变成咪唑杂环。这些带有S-氟乙酸酯基团的新的咪唑杂环衍生物可以容易地改性以产生药学上有吸引力的化合物。
Imidazopyridine derivatives and compositions containing them
申请人:Synthelabo
公开号:US04847263A1
公开(公告)日:1989-07-11
Imidazo[1,2-a]pyridine derivatives of the general formula (I) ##STR1## wherein Y.sub.1 represents hydrogen, halogen or (C.sub.1-4) alkyl, Y.sub.2 represents --SR in which R is hydrogen, (C.sub.1-4) alkyl or (4-alkoxyphenyl)methyl or hydroxy or (C.sub.1-4) alkoxy, X represents hydrogen, halogen, (C.sub.1-4) alkoxy, (C.sub.1-4) alkyl, --CF.sub.3, --CH.sub.3 S, --NO.sub.2 or --NH.sub.2, and R.sub.1 and R2, which may be the same or different, represent hydrogen or (C.sub.1-4) alkyl have useful therapeutic properties.