Réaction #57464

Équation de réaction

tert-butyl N-[(1S,2R)-1-benzyl-4-(cyclopentyloxy)-2-hydroxy-4-(6-quinoxalinylsulfonyl)butyl]carbamate

trifluoroacetic acid

→

(3R,4S)-4-amino-1-(cyclopentyloxy)-5-phenyl-1-(6-quinoxalinylsulfonyl)-3-pentanol

Rendement 82.4%

Conditions de réaction

Traitement

1. 1
   AutreThe acid was removed in vacuo
2. 2
   Autrethe residue was partitioned between dichloromethane and 1N sodium hydroxide
3. 3
   AutreThe organic layer was separated
4. 4
   Extractionthe aqueous layer was extracted again with dichloromethane
5. 5
   SéchageThe combined organic layers were dried over anhydrous sodium sulfate
6. 6
   Filtrationfiltered
7. 7
   Autreevaporated in vacuo
8. 8
   AutreThe crude product was purified on flash grade silica gel eluting with dichloromethane:methanol (98:2)
9. 9
   workup.ADDITIONFractions containing the product
10. 10
    Autreevaporated in vacuo
11. 11
    Autredried under high vacuum

Mode opératoire

A mixture of tert-butyl N-[(1S,2R)-1-benzyl-4-(cyclopentyloxy)-2-hydroxy-4-(6-quinoxalinylsulfonyl)butyl]carbamate (563 mg, 1.01 mmol) and trifluoroacetic acid (5 mL) was stirred under an Argon atmosphere for 0.5 hrs. The acid was removed in vacuo and the residue was partitioned between dichloromethane and 1N sodium hydroxide. The organic layer was separated and the aqueous layer was extracted again with dichloromethane. The combined organic layers were dried over anhydrous sodium sulfate, filtered and evaporated in vacuo. The crude product was purified on flash grade silica gel eluting with dichloromethane:methanol (98:2). Fractions containing the product were combined and evaporated in vacuo and dried under high vacuum to provide (3R,4S)-4-amino-1-(cyclopentyloxy)-5-phenyl-1-(6-quinoxalinylsulfonyl)-3-pentanol as a foam (379 mg, 82%). H1-NMR (chloroform-D3): 1.66 (m, 11H), 2.51 (m, 1H), 2.86 (m, 1H), 3.07 (m, 1H), 3.23 (m, 1H), 3.32 (m, 1H), 3.84 (m, 1H), 4.90 (m, 1H), 7.20 (m, 5H), 8.16 (m, 1H), 8.28 (d, 1H), 8.70 (m, 1H), 8.99 (m, 2H). MS (ESI): 457 (M+H).

Source