Trifluoroacetic acid → 4-(8-((3,3-dimethylpiperazin-1-yl)methyl)-2-(2-ethyl-1H-benzo[d]imidazol-1-yl)-9-methyl-9H-purin-6-yl)morpholine

HRID 1923249Notes

Reaction equation

HRID 1923249 reaction equation
C(O)(C(F)(F)F)=O.C(OC([N:15]1[CH2:20][CH2:19][N:18]([CH2:21][C:22]2[N:23]([CH3:48])[C:24]3[C:29]([N:30]=2)=[C:28]([N:31]2[CH2:36][CH2:35][O:34][CH2:33][CH2:32]2)[N:27]=[C:26]([N:37]2[C:41]4[CH:42]=[CH:43][CH:44]=[CH:45][C:40]=4[N:39]=[C:38]2[CH2:46][CH3:47])[N:25]=3)[CH2:17][C:16]1([CH3:50])[CH3:49])=O)(C)(C)C>C(Cl)Cl>[CH3:50][C:16]1([CH3:49])[NH:15][CH2:20][CH2:19][N:18]([CH2:21][C:22]2[N:23]([CH3:48])[C:24]3[C:29]([N:30]=2)=[C:28]([N:31]2[CH2:36][CH2:35][O:34][CH2:33][CH2:32]2)[N:27]=[C:26]([N:37]2[C:41]4[CH:42]=[CH:43][CH:44]=[CH:45][C:40]=4[N:39]=[C:38]2[CH2:46][CH3:47])[N:25]=3)[CH2:17]1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 674922904-[2-(2-ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl]-2,2-dimethylpiperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 596053114-(8-((3,3-dimethylpiperazin-1-yl)methyl)-2-(2-ethyl-1H-benzo[d]imidazol-1-yl)-9-methyl-9H-purin-6-yl)morpholineYield 22%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 2-(2-ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde (530 mg, 1.35 mmol), 2,2-dimethylpiperazine-1-carboxylic acid tert-butyl ester (350 mg, 1.63 mmol) and molecular sieves (4 Å, powdered, 2.5 g) in DCE (30 mL) was stirred at ambient temperature for 5 h. Sodium triacetoxyborohydride (427 mg, 2.02 mmol) was added and the mixture stirred for 17 h, then loaded onto an Isolute® SCX-2 cartridge (25 g). The cartridge was then washed with methanol and the desired product was subsequently eluted using 2 M NH3 in MeOH. The product was collected and concentrated in vacuo. The resultant residue was purified by flash chromatography (Si—PPC, EtOAc:MeOH; 100:0 to 95:5 to 90:10) to give 4-[2-(2-ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl]-2,2-dimethylpiperazine-1-carboxylic acid tert-butyl ester. TFA (3 mL) was added to a solution of 4-[2-(2-ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl]-2,2-dimethylpiperazine-1-carboxylic acid tert-butyl ester in DCM (10 mL) and the mixture stirred at ambient temperature for 1 h. The reaction mixture was loaded onto an Isolute® SCX-2 cartridge (10 g), which was washed with MeOH before the desired product was subsequently eluted using 2 M NH3 in MeOH. The product was collected and concentrated in vacuo. The resultant residue was purified by flash chromatography (Si—PPC, DCM:MeOH 100:0 to 98:2 to 95:5 to 90:10 to 80:20) to afford 552 as a cream solid (144 mg, 22%). LCMS (Method I): RT=2.56 min, M+H+=490. 1H NMR (CDCl3, 400 MHz) δ 8.02 (m, 1 H); 7.75 (m, 1 H); 7.29 (m, 2 H); 4.35 (m, 4 H); 3.92-3.83 (m, 7 H); 3.70 (s, 2 H); 3.36 (q, J=7.5 Hz, 2 H); 2.97 (m, 2 H); 2.47 (m, 2 H); 2.28 (s, 2 H); 1.49-1.42 (m, 3 H) and 1.19 (s, 6 H)

Workup

  1. washwas washed with MeOH before the desired product
  2. washwas subsequently eluted
  3. customThe product was collected
  4. concentrationconcentrated in vacuo
  5. customThe resultant residue was purified by flash chromatography (Si—PPC, DCM:MeOH 100:0 to 98:2 to 95:5 to 90:10 to 80:20)

Sources & evidence

ORD record
ord-a89236cbf1514f7d818e6e52be285a4f
Source dataset
uspto-grants-2012_05
Patent number
US08173650B2

Reaction notes

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