反应详情

A solution of 1.5 g (8.8 mmol) 6-chloro-N-methyl-nicotinamide in 18 ml THF was added at 4° C. over 15 min to a solution of 21.9 ml (21.9 mmol) o-tolylmagnesium chloride 1M in THF. The reaction mixture was stirred at r.t. for 2 h cooled to 4° C. and treated dropwise over 10 min with 30.0 ml 5% aqueous NH4Cl. The aqueous phase was separated and extracted twice with THF and the organic phases were washed twice with 5% aqueous NH4Cl. The combined organic phases were dried over Na2SO4 and subsequently treated at r.t. in four portions over 10 h with 0.9 g (5.7 mmol) KMnO4. The reaction mixture was stirred for 5.5 h at r.t., filtrated and the solvent was removed. The residue was purified by chromatography over silica gel (CHCl3) to yield 1.8 g (78.9%) product as a yellow oil.

1. temperaturecooled to 4° C.
2. customThe aqueous phase was separated
3. extractionextracted twice with THF
4. washthe organic phases were washed twice with 5% aqueous NH4Cl
5. dry with materialThe combined organic phases were dried over Na2SO4
6. stirringThe reaction mixture was stirred for 5.5 h at r.t.
7. filtrationfiltrated
8. customthe solvent was removed
9. customThe residue was purified by chromatography over silica gel (CHCl3)