A series of 2-imino-6-methylhexahydropyrimidin-4-one derivatives, and analogues thereof, substituted in the 6-position by an arylcarbonylaminophenyl or heteroarylcarbonylaminophenyl moiety, being potent inhibitors of the growth and propagation of the Plasmodium falciparum parasite in human blood, are beneficial as pharmaceutical agents, especially in the treatment of malaria.
Pyridine-phosphinimine ligand-accelerated Cu(<scp>i</scp>)-catalyzed azide–alkyne cycloaddition for preparation of 1-(pyridin-2-yl)-1,2,3-triazole derivatives
5-a]pyridines and alkynes for the first time. By optimizing the reaction conditions, an efficient catalytic system (CuCl/2-PyCH2N[double bond, length as m-dash]P(t)Bu3) was developed to give 1-(pyridin-2-yl)-1,2,3-triazole derivatives in moderate to excellent yields (46-98%).
denitrogenative C(sp3)-Hamination of 1,2,3,4-tetrazoles bearing unactivated primary, secondary and tertiary C-H bonds is discovered. This cata-lytic amination follows an unprecedented metalloradical activation mechanism. The utility of the developed method is showcased with the short synthesis of a bioactive mole-cule. Moreover, an initial effort has been embarked for the enantioselective C(sp3)-H amination
Application of the intramolecular aza-Wittig reaction to the synthesis of pyrido[2,3-d]pyrimidines
作者:Johann Chan、Margaret Faul
DOI:10.1016/j.tetlet.2006.03.091
日期:2006.5
Pyrido[2,3-d]pyrimidines are synthesized in a two-step procedure from amides and tetrazolo[1,5-a]pyridine-8-carbonyl chloride. Reaction of the crude imides with triphenylphosphine effects an intramolecularaza-Wittigreaction to afford a variety of substituted pyrido[2,3-d]pyrimidines in good to moderate yields (30–76%).
吡啶并[2,3- d ]嘧啶是由酰胺和四唑并[1,5 - a ]吡啶-8-羰基氯经两步合成的。粗酰亚胺与三苯基膦的反应会引起分子内aza-Wittig反应,从而以良好至中等的收率(30–76%)提供各种取代的吡啶并[2,3- d ]嘧啶。
The N-Alkylation of Substituted 4-Tetrazolo[1,5-a]pyridines: Easy Access to a New Series of Electrophiles
The alkylation of 4-substituted tetrazolo-pyridines bearing electron-withdrawing groups 7a–f to give the expected tetrazolo-pyridinium salts 7a–f,Me or 7a–f,Et as a mixture of two N3/N2 isomers in good to quantitative yields in toluene, has been investigated. The nature of the alkyl group did not significantly affect the chemical shifts of the salts or the N3/N2 ratio, which was approximately 9:1,