Reaktion #57491

Reaktionsgleichung

(3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl (1S,2R)-1-benzyl-3-[(1-ethylpropoxy)amino]-2-hydroxypropylcarbamate

4-nitrophenylsulphonyl chloride

diisoproylethylamine

→

(3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl (1S,2R)-1-benzyl-3-{(1-ethylpropoxy)[(4-nitrophenyl)sulfonyl]amino}-2-hydroxypropylcarbamate

Ausbeute 88.2%

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction was evaporated in vacuo
2. 2
   Sonstigethe residue was partitioned between dichloromethane and aqueous sodium hydrogen sulfate (1N)
3. 3
   SonstigeThe phases were separated
4. 4
   Extraktionthe aqueous layer was extracted with dichloromethane
5. 5
   TrocknenThe combined organic phases were dried over anhydrous magnesium sulfate
6. 6
   Filtrationfiltered
7. 7
   Sonstigeevaporated in vacuo
8. 8
   SonstigeThe residue was purified on flash grade silica gel eluting with 1:1 ethyl acetate
9. 9
   workup.ADDITIONFractions containing the product
10. 10
    Sonstigeevaporated in vacuo
11. 11
    Sonstigedried under high vacuum

Vorschrift

A mixture of (3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl (1S,2R)-1-benzyl-3-[(1-ethylpropoxy)amino]-2-hydroxypropylcarbamate (200 mg, 0.474 mmol), 4-nitrophenylsulphonyl chloride (105 mg, 0.474 mmol), diisoproylethylamine (0.084 mL, 0.474 mmol) and dimethylaminopyridine (˜1 mg) in anhydrous tetrahydrofuran (3 mL) was stirred at ambient temperature over 16 hours under an Argon atmosphere. The reaction was evaporated in vacuo and the residue was partitioned between dichloromethane and aqueous sodium hydrogen sulfate (1N). The phases were separated and the aqueous layer was extracted with dichloromethane. The combined organic phases were dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo. The residue was purified on flash grade silica gel eluting with 1:1 ethyl acetate:hexane. Fractions containing the product were combined, evaporated in vacuo and dried under high vacuum to provide (3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl (1S,2R)-1-benzyl-3-{(1-ethylpropoxy)[(4-nitrophenyl)sulfonyl]amino}-2-hydroxypropylcarbamate (254 mg, 88%) as a foam. H1-NMR (chloroform-D3): 0.90 (m, 6H), 1.60 (m, 7H), 2.90 (m, 5H), 3.68 (m, 2H), 3.87 (m, 4H), 4.17 (m, 1H), 4.83 (d, 1H), 5.02 (m, 1H), 5.64 (d, 1H), 7.23 (m, 5H), 7.99 (d, 2H), 8.38 (d, 2H). MS(ESI): 630(M+Na).

Quelle