Acetic Acid → 7-(2-(Perhydro-2h-pyran-4-ylamino)ethylamino)-2,5-dimethyl-3-(4-chloro-2,6-dimethylphenyl)-pyrazolo[1,5-a] pyrimidine

HRID 842013Notes

Reaction equation

HRID 842013 reaction equation
[NH2:1][CH2:2][CH2:3][NH:4][C:5]1[N:10]2[N:11]=[C:12]([CH3:23])[C:13]([C:14]3[C:19]([CH3:20])=[CH:18][C:17]([Cl:21])=[CH:16][C:15]=3[CH3:22])=[C:9]2[N:8]=[C:7]([CH3:24])[CH:6]=1.[O:25]1[CH2:30][CH2:29][C:28](=O)[CH2:27][CH2:26]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(O)(=O)C>ClC(Cl)C>[O:25]1[CH2:30][CH2:29][CH:28]([NH:1][CH2:2][CH2:3][NH:4][C:5]2[N:10]3[N:11]=[C:12]([CH3:23])[C:13]([C:14]4[C:15]([CH3:22])=[CH:16][C:17]([Cl:21])=[CH:18][C:19]=4[CH3:20])=[C:9]3[N:8]=[C:7]([CH3:24])[CH:6]=2)[CH2:27][CH2:26]1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 121599Tetrahydro-4H-pyran-4-oneHCID 5049666Sodium triacetoxyborohydrideHCID 184070017-(2-Aminoethylamino)-2,5-dimethyl-3-(4-chloro-2,6-dimethylphenyl)-pyrazolo[1,5-a] pyrimidine

Product 1

HCID 120499877-(2-(Perhydro-2h-pyran-4-ylamino)ethylamino)-2,5-dimethyl-3-(4-chloro-2,6-dimethylphenyl)-pyrazolo[1,5-a] pyrimidineYield 69.2%

Reagents, catalysts & solvents 1

HCID 63651,1-DichloroethaneSolvent

Procedure

Dissolve 7-(2-aminoethylamino)-2,5-dimethyl-3-(4-chloro-2,6-dimethylphenyl)-pyrazolo [1,5-a] pyrimidine (0.183 g, 5.4×10−4 mol, 339.2 g/mol) in dichloroethane (5 mL) and add tetrahydro-4H-pyran-4-one (0.068 g, 0.060 mL, 100.12 g/mol) and sodium triacetoxyborohydride (0.172 g, 211.94 g/mol). To the resultant slurry, add glacial acetic acid (0.032 mL, 5.4×10−4 mol) and stir at ambient temperature under N2 for 3 hours. Partition between CH2Cl2 (3 mL) and 1.0 N NaOH (10 mL), then separate the layers and chromatograph the CH2Cl2 layer using [10% (2.0M NH3 in MeOH)/90% CH2Cl2] as eluent. Obtained 0.16 g white solid-foam upon evaporation. TLC: Rf=0.65. LCMS=422.5 (MH+); 420.5 (M−). 1H-NMR (CDCl3): 6.67 (s, 2H); 5.79 (d, 1H, J=8.8 Hz); 3.98 (br. d, 2H, J=12 Hz); 3.78 (s, 3H); 3.52 (t, 2H, J=6 Hz); 3.39 (br. t, 2H, J=12 Hz); 3.37 (s, 1H); 3.04 (t, 2H, J=6 Hz); 2.75-2.81 (m, 2H); 2.40 (s, 3H); 2.18 (s, 3H); 2.00 (s, 6H); 1.89 (br. d, 2H, J=12 Hz); 1.47-1.53 (m, 2H).

Workup

  1. customPartition between CH2Cl2 (3 mL) and 1.0 N NaOH (10 mL)
  2. customseparate the layers and chromatograph the CH2Cl2 layer

Sources & evidence

ORD record
ord-c4539fe2bc164a858bd3dc73a7b51fe2
Source dataset
uspto-grants-2002_04
Patent number
US06372743B1

Reaction notes

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