Formaldehyde → 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)(methyl)amino)cyclobutyl)propanoate

HRID 511677Notes

Reaction equation

HRID 511677 reaction equation
[NH2:1][C:2]1[N:10]=[CH:9][N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[C@H:11]1[C@@H:15]2[O:16][C:17]([CH3:20])([CH3:19])[O:18][C@@H:14]2[C@@H:13]([CH2:21][NH:22][CH:23]2[CH2:26][CH:25]([CH2:27][CH2:28][C:29]([O:31][CH2:32][C:33]3[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=3)=[O:30])[CH2:24]2)[O:12]1.C=O.O.[C:42]([BH3-])#N.[Na+]>CO>[NH2:1][C:2]1[N:10]=[CH:9][N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[C@H:11]1[C@@H:15]2[O:16][C:17]([CH3:19])([CH3:20])[O:18][C@@H:14]2[C@@H:13]([CH2:21][N:22]([CH3:42])[CH:23]2[CH2:26][CH:25]([CH2:27][CH2:28][C:29]([O:31][CH2:32][C:33]3[CH:34]=[CH:35][CH:36]=[CH:37][CH:38]=3)=[O:30])[CH2:24]2)[O:12]1

Participants

6

Reactant 4

HCID 712FormaldehydeHCID 962Water2×HCID 5003444Sodium cyanoborohydrideHCID 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

Product 1

HCID 67774903Benzyl 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)(methyl)amino)cyclobutyl)propanoateYield 62.4%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

Benzyl 3-[3-({[(3aR,4R,6R,6aR)-6-(6-amino-9H-purin-9-yl)-2,2-dimethyl-tetrahydro-2H-furo[3,4-d][1,3]dioxol-4-yl]methyl}amino)cyclobutyl]propanoate (3.2 g, 6.12 mmol) was dissolved in methanol (32 ml). Formaldehyde in water (37%) (0.92 ml, 12.3 mmol) was added and stirred for 45 min before adding sodium cyanoborohydride (0.54 g, 8.57 mmol) portionwise. The reaction was stirred for 2 h at r.t. before adding water (1 ml) and evaporating off the solvent at r.t. The residue was purified by chromatography with 7M ammonia in methanol/DCM to give the desired compound as a yellow oil (mix of diastereomers) (2.05 g, 62%, 82% pure): MS (ESI+) for C28H36N6O5 m/z 537.6 [M+H]+; LC purity 82% (ret. time, 1.60 min); 1H NMR (500 MHz, CDCl3) δH 8.32-8.38 (m, 1H), 7.91-7.97 (m, 1H), 7.32-7.39 (m, 5H), 6.05-6.10 (m, 1H), 5.61 (br. s., 2H), 5.53 (ddd, J=16.5, 6.4, 1.8 Hz, 1H), 5.11 (m, 2H), 4.93-5.00 (m, 1H), 4.32-4.40 (m, 1H), 2.50-2.88 (m, 1H), 2.37-2.49 (m, 2H), 2.21-2.30 (m, 2H), 2.10 (m, 3H), 1.91-2.04 (m, 1H), 1.73-1.79 (m, 2H), 1.64-1.72 (m, 2H), 1.56-1.63 (m, 4H), 1.41 (s, 3H), 1.15 (q, J=9.7 Hz, 1H).

Workup

  1. stirringThe reaction was stirred for 2 h at r.t.
  2. customevaporating off the solvent at r.t
  3. customThe residue was purified by chromatography with 7M ammonia in methanol/DCM

Sources & evidence

ORD record
ord-c93f69bdae3048648e2e5f2e76df04e8
Source dataset
uspto-grants-2015_08
Patent number
US09096634B2

Reaction notes

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