Réaction #69977

Équation de réaction

sodium borohydride

4-oxoadamantane-1-carboxylic acid methyl ester

ammonia

→

4-aminoadamantane-1-carboxylic acid methyl ester

Solvants

methanol

methanol

Conditions de réaction

Traitement

1. 1
   workup.STIRRINGthe reaction medium is stirred for a further 3 h
2. 2
   ConcentrationAfter concentrating to dryness under reduced pressure
3. 3
   workup.ADDITIONadding water and ethyl acetate
4. 4
   Extractionthe aqueous phase is extracted three times in ethyl acetate
5. 5
   Séchagedried over magnesium sulphate
6. 6
   Concentrationconcentrated to dryness
7. 7
   AutreThe crude product obtained
8. 8
   Autreis chromatographed on silica gel, elution

Mode opératoire

5 g of 4-oxoadamantane-1-carboxylic acid methyl ester are placed in 26 ml of methanol under nitrogen. 86 ml of a 7N solution of ammonia in methanol are added. The reaction medium is stirred for 18 h, 4 g of sodium borohydride are then added at 0° C. and the reaction medium is stirred for a further 3 h. After concentrating to dryness under reduced pressure and adding water and ethyl acetate, the aqueous phase is extracted three times in ethyl acetate. The organic phases are combined, dried over magnesium sulphate and concentrated to dryness. The crude product obtained is chromatographed on silica gel, elution being carried out with a gradient of heptane/acetone/methanol/NH4OH solvent from 1/0/0 to 4/5/1/0.1. 1.5 g of 4-aminoadamantane-1-carboxylic acid methyl ester are obtained in the form of a mixture of cis/trans (1/3) isomers.

Source