تفاعل #57491

معادلة التفاعل

(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

المردود 88.2%

المذيبات

tetrahydrofuran

ظروف التفاعل

المعالجة

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

الإجراء التجريبي

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).

المصدر