Acetic Acid → 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 511676Notes

Reaction equation

HRID 511676 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.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl.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

6

Reactant 4

HCID 176Acetic AcidHCID 5049666Sodium triacetoxyborohydrideHCID 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)propanoateYield 61.6%

Reagents, catalysts & solvents 1

HCID 18432038DCE iPrOHSolvent

Procedure

A suspension of 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 (5.00 g, 16.3 mmol), benzyl 3-(3-oxocyclobutyl)-propanoate (4.17 g, 18.0 mmol) and acetic acid (0.85 ml, 14.8 mmol) in DCE:iPrOH (7:2) (90 ml) was stirred at r.t. for 2 h. Sodium triacetoxyborohydride (4.40 g, 20.8 mmol) was added in portions and the mixture left to stir for 18 h at r.t. The reaction mixture was quenched with 1M Na2CO3 solution (10 ml) and the product was extracted with DCM (3×30 ml). The combined organic layers were dried over Na2SO4, filtered and evaporated to dryness. Purification by silica gel flash column chromatography eluting with 1% 7M NH3 in MeOH:99% DCM gave the product as a yellow oil (5.25 g, 55%, 89% pure): MS (ESI+) for C27H34N6O5 m/z 523.6 [M+H]+; LC purity 89% (ret. time, 1.60 min); 1H NMR (500 MHz, CDCl3) δH 8.35 (d, J=6.0 Hz, 1H), 7.91 (s, 1H), 7.30-7.39 (m, 5H), 6.01 (dd, J=3.0 Hz, 1.6, 1H), 5.72 (br. s., 2H), 5.50 (dt, J=6.4 Hz, 3.3, 1H), 5.10 (d, J=3.8 Hz, 2H), 4.98-5.04 (m, 1H), 4.31-4.38 (m, 1H), 2.97-3.34 (m, 1H), 2.72-2.85 (m, 2H), 2.22-2.35 (m, 3H), 2.14 (td, J=8.3, 4.3 Hz, 1H), 1.73-1.90 (m, 4H), 1.64-1.71 (m, 1H), 1.62 (d, J=1.4 Hz, 3H), 1.39 (s, 3H), 1.10-1.27 (m, 1H).

Workup

  1. waitthe mixture left
  2. stirringto stir for 18 h at r.t
  3. customThe reaction mixture was quenched with 1M Na2CO3 solution (10 ml)
  4. extractionthe product was extracted with DCM (3×30 ml)
  5. dry with materialThe combined organic layers were dried over Na2SO4
  6. filtrationfiltered
  7. customevaporated to dryness
  8. customPurification by silica gel flash column chromatography
  9. washeluting with 1% 7M NH3 in MeOH

Sources & evidence

ORD record
ord-a9007e903af34bb282af3bb28cbd4b00
Source dataset
uspto-grants-2015_08
Patent number
US09096634B2

Reaction notes

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