1,2-Dichloroethane → benzyl 3-(3-((((3aR,4R,6R,6aR)-6-(6-amino-9H-purin-9-yl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl)amino)cyclobutyl)propanoate

HRID 2040710Notes

Reaction equation

HRID 2040710 reaction equation
[NH2:1][CH2:2][C@@H:3]1[C@H:7]2[O:8][C:9]([CH3:12])([CH3:11])[O:10][C@H:6]2[C@H:5]([N:13]2[CH:21]=[N:20][C:19]3[C:14]2=[N:15][CH:16]=[N:17][C:18]=3[NH2:22])[O:4]1.O=[C:24]1[CH2:27][CH:26]([CH2:28][CH2:29][C:30]([O:32][CH2:33][C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)=[O:31])[CH2:25]1.C(O)(=O)C.ClCCCl>ClCCCl.CC(O)C.CC(O)C>[NH2:22][C:18]1[N:17]=[CH:16][N:15]=[C:14]2[C:19]=1[N:20]=[CH:21][N:13]2[C@H:5]1[C@@H:6]2[O:10][C:9]([CH3:12])([CH3:11])[O:8][C@@H:7]2[C@@H:3]([CH2:2][NH:1][CH:24]2[CH2:27][CH:26]([CH2:28][CH2:29][C:30]([O:32][CH2:33][C:34]3[CH:35]=[CH:36][CH:37]=[CH:38][CH:39]=3)=[O:31])[CH2:25]2)[O:4]1

Participants

7

Reactant 4

HCID 111,2-DichloroethaneHCID 176Acetic AcidHCID 113012155'-Amino-5'-deoxy-2',3'-O-(1-methylethylidene)-adenosineHCID 67774851Benzyl 3-(3-oxocyclobutyl)propanoate

Product 1

HCID 67775599benzyl 3-(3-((((3aR,4R,6R,6aR)-6-(6-amino-9H-purin-9-yl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl)amino)cyclobutyl)propanoate

Reagents, catalysts & solvents 2

HCID 3776IsopropanolSolventHCID 18432038DCE iPrOHSolvent

Procedure

A suspension of the 9-[(3aR,4R,6R,6aR)-6-(aminomethyl)-2,2-dimethyl-tetrahydro-2H-furo[3,4-d][1,3]dioxol-4-yl]-9H-purin-6-amine (1.45 g, 4.736 mmol), benzyl 3-(3-oxocyclobutyl)propanoate (1.21 g, 5.209 mmol) and acetic acid (246.45 μl, 4.31 mmol) in DCE:iPrOH (4:1, 50 ml) was stirred at RT for 1 h. A further aliquot of DCE (40 ml) and iPrOH (5 ml) was added to the reaction mixture and continued for 1 hour. STAB (1.28 g, 6.03 mmol) was then added and the reaction mixture was stirred for 18 hours. The reaction mixture was quenched with 1N Na2CO3 (10 ml), and the product was extracted with DCM (2×30 ml). This was dried over Na2SO4, filtered and evaporated to dryness. Purification by silica gel column chromatography, eluting with 7N NH3 in MeOH:DCM (1:99-3:97) gave the desired product as a colourless oil, 1.51 g (58%); MS (ESI+) for C27H34N6O5 m/z 523.65 [M+H]+; HPLC purity 97% (ret. time, 1.43 min); 1H NMR (500 MHz, CHLOROFORM-d) δH ppm 8.35 (d, J=5.3 Hz, 1H), 7.87 (d, J=33.8 Hz, 1H), 7.40-7.29 (m, 5H), 6.08-5.94 (m, 1H), 5.59-5.42 (m, 3H), 5.10 (d, J=4.0 Hz, 2H), 5.03-4.96 (m, 1H), 4.33 (dq, J=7.3, 3.9 Hz, 1H), 3.12 (ddd, J=23.0, 14.6, 7.5 Hz, 1H), 2.85-2.77 (m, 1H), 2.74 (dd, J=12.5, 6.6 Hz, 1H), 2.39-2.07 (m, 4H), 1.90-1.64 (m, 5H), 1.61 (s, 4H), 1.38 (s, 3H), 1.28-1.06 (m, 1H).

Workup

  1. waitcontinued for 1 hour
  2. additionSTAB (1.28 g, 6.03 mmol) was then added
  3. stirringthe reaction mixture was stirred for 18 hours
  4. customThe reaction mixture was quenched with 1N Na2CO3 (10 ml)
  5. extractionthe product was extracted with DCM (2×30 ml)
  6. dry with materialThis was dried over Na2SO4
  7. filtrationfiltered
  8. customevaporated to dryness
  9. customPurification by silica gel column chromatography
  10. washeluting with 7N NH3 in MeOH:DCM (1:99-3:97)

Sources & evidence

ORD record
ord-001c91059ca6435db0cf38bb76883c6d
Source dataset
uspto-grants-2013_11
Patent number
US08580762B2

Reaction notes

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