نتایج جستجو برای: 3 c pyrazoles
تعداد نتایج: 2600367 فیلتر نتایج به سال:
The solvent-free reaction between 5-amino-1H-pyrazoles and -triketones (2-acetyldimedone and 2acetylindandione) leads to the formation of new fused pyrazolo[1,5-a]pyrimidines in good yields. A possible mechanistic route is postulated on the basis of the isolation of the cyclization intermediate. The structures and regiospecificity of the reaction were determined on the basis of nmr measurements...
Despite notable recent efforts, a catalytic and convenient strategy for the direct alkylation of unactivated allylic or benzylic sp C–H bonds remains a formidable challenge facing the synthesis community. We herein report an unprecedented allylic/benzylic alkylation using only an organo-photoredox catalyst, which enables coupling of a broad scope of alkenes/arenes and electron-deficient alkenes...
1-Cycloalkyl-2-propene-1-ones were synthesized by electrophilic addition of cycloalkanecarboxylic acid chlorides and its mono- dichloride-substituted derivatives to ethylene in the presence an AlCl3 catalyst at a temperature –10 ÷ –150C dichloroethane medium. The resulting vinyl ketones converted chlorination CCl4 –50C corresponding 1-cycloalkyl-2,3-dichloro-1-propanones, which form 1-R´-3-cycl...
2,3-dihydro-1H-pyrazoles were highly selectively synthesized via the Pd(0)-catalyzed coupling-cyclization reaction of 4-non-substituted 2-substituted 2,3-allenyl hydrazines with aryl iodides in moderate to good yields.
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید