反应详情

Dess-Martin periodinane (50.0 g, 0.118 mol, 1.34 eq) was portionwise added to a solution of 4 (21.0 g, 0.088 mol) in dichloromethane:pyridine 10:1 (1.1 L). The resulting solution was stirred at room temperature for 2 h and then water (700 mL) was added. The mixture was stirred for a further 5 min, and then the layers were separated. The aqueous layer was extracted with dichloromethane (1×11), the combined organic phase dried and the solvent evaporated to give a brown solid which was purified by column chromatography (EtOAc:hexane 1:2) to afford (4-formyl-6-methyl-pyridine-2-yl)-carbamic acid tert-butyl ester 5 (20.5 g, 99%) as a pale orange solid.

1. stirringThe mixture was stirred for a further 5 min
2. customthe layers were separated
3. extractionThe aqueous layer was extracted with dichloromethane (1×11)
4. customthe combined organic phase dried
5. customthe solvent evaporated
6. customto give a brown solid which
7. customwas purified by column chromatography (EtOAc:hexane 1:2)