Hydrochloric Acid → tert-butyl (3RS,4RS)-4-(4-hydroxymethyl-phenyl)-3-(naphthalen-2-ylmethoxy)-piperidine-1-carboxylate

A solution of 1.07 g (1.48 mmol) of tert-butyl (3RS,4RS)-3-naphthalen-2-ylmethoxy-4-(4-trityloxymethyl-phenyl)-piperidine-1-carboxylate in 15 ml of methylene chloride was treated at room temperature with 2 ml of 2N hydrogen chloride in methanol and the mixture was stirred at room temperature for 15 minutes. Subsequently, the solution was poured into 30 ml of saturated sodium carbonate solution and this was extracted twice with 50 ml of ethyl acetate each time. The combined organic phases were dried over sodium sulphate and evaporated under reduced pressure. For purification, the crude product was chromatographed on silica gel using a 99:1 mixture of methylene chloride and methanol as the eluent. There were obtained 580 mg (82% of theory) of tert-butyl (3RS,4RS)-4-(4-hydroxymethyl-phenyl)-3-(naphthalen-2-ylmethoxy)-piperidine-1-carboxylate as a colourless oil; MS: 447 (M)+.

1. extractionthis was extracted twice with 50 ml of ethyl acetate each time
2. dry with materialThe combined organic phases were dried over sodium sulphate
3. customevaporated under reduced pressure
4. customFor purification
5. customthe crude product was chromatographed on silica gel using
6. additiona 99:1 mixture of methylene chloride and methanol as the eluent

ORD-Eintrag

ord-bfc8652213414f07a0645fb993aaf98c

Quelldatensatz

uspto-grants-2000_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06150526