4-(Methoxymethylcarbamoyl)piperidine-1-carboxylic acid tert-butyl ester → N-Boc-(2,3-dimethoxyphenyl)-4-piperidinylmethanone

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Into a 500-mL jacketed-bottom-drain resin pot fitted with a five-joint head equipped with a mechanical stirrer, a thermocouple, a reflux condenser topped with a nitrogen bubbler, a septum, and a stopper was placed 28.9 g (0.092 mol) of 4-[(methoxymethylamino)carbonyl]-1-piperidinecarboxylic acid, 1,1-dimethylethyl ester (15) (28.9 g, 0.092 mol, 87% pure) and 80 g of tetrahydrofuran. The solution was cooled to −17° C. and the cold lithiated veratrole/tetrahydrofuran slurry was added via cannula while maintaining the internal reaction temperature below −10° C. (15 minutes addition). The reaction mixture was then warmed to 10° C. and stirred for 3 hours. The solution may be used directly in Scheme L, step a, Example 109.

Herkunft & Nachweise