Diisopropylamine → (3R)-tert-butyl 3-(methoxy(methyl)carbamoyl)-3,4-dihydroisoquinoline-2(1H)-carboxylate

Participants

Reaction Conditions

Reaction Steps

6.95 g of Boc-D-Tic-OH are dissolved in 25 ml of dichloromethane. 2.69 g of dimethylhydroxylamine hydrochloride and 11.68 g of bromotrispyrrolidino-phosphonium hexafluorophosphate are added. After cooling of the solution to 0° C., 9.72 ml of diisopropylamine are slowly added. The reaction medium is then stirred at ambient temperature for 16 h. After hydrolysis, extraction is carried out with ethyl acetate until the aqueous phase is completely depleted. Drying over MgSO4 and concentration to dryness are carried out. The crude obtained is chromatographed on silica gel, elution being carried out with a 99/1 mixture of dichloromethane and methanol. 7.4 g of tert-butyl (3R)-3-{[methoxy(methyl)amino]carbonyl}-3,4-dihydroisoquinoline-2(1H)-carboxylate are obtained.

Provenance & Evidence