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An efficient method is developed for the synthesis of imidazo[1,5-a]pyridine from the reaction of 1,1-dibromo-1-alkenes with 2-aminomethylpyridines. The reaction requires an inorganic base, such as Na 2 CO 3 , and moderate heating in DMF to proceed. Moderate to good yields are obtained. As demonstrated by the authors and others, 1,1-dibromo-1-alkenes are employed as synthons for activated...
Optically pure dimeric O-demethylmurrayafoline A (1) and its 6,6′-dimethoxyl analog 2 were synthesized via the resolution of their corresponding camphorsulfonates of the racemates. The absolute configurations of (+) -1, (+) -2 and (−) -2 were assigned as (a R) and (a S), respectively, by the X-ray analysis and CD spectrum.
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