Acetic Acid → HCID 178433744, compound

HRID 2402060Notes

Reaction equation

HRID 2402060 reaction equation
[Cl:1][C:2]1[CH:30]=[CH:29][C:5]([CH2:6][C:7]2[N:8]=[C:9]([C:17]3[C:18]([CH3:28])=[N:19][N:20]4[CH:25]=[CH:24][C:23]([CH:26]=O)=[CH:22][C:21]=34)[S:10][C:11]=2[C:12]2[NH:16][CH:15]=[N:14][N:13]=2)=[CH:4][CH:3]=1.[N:31]1([C:37]([O:39][C:40]([CH3:43])([CH3:42])[CH3:41])=[O:38])[CH2:36][CH2:35][NH:34][CH2:33][CH2:32]1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(Cl)Cl>[Cl:1][C:2]1[CH:30]=[CH:29][C:5]([CH2:6][C:7]2[N:8]=[C:9]([C:17]3[C:18]([CH3:28])=[N:19][N:20]4[CH:25]=[CH:24][C:23]([CH2:26][N:34]5[CH2:35][CH2:36][N:31]([C:37]([O:39][C:40]([CH3:43])([CH3:42])[CH3:41])=[O:38])[CH2:32][CH2:33]5)=[CH:22][C:21]=34)[S:10][C:11]=2[C:12]2[NH:16][CH:15]=[N:14][N:13]=2)=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 143452tert-Butyl piperazine-1-carboxylateHCID 5049666Sodium triacetoxyborohydrideHCID 178433750HCID 178433750, compound

Product 1

HCID 178433744HCID 178433744, compoundYield 70.5%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 3-[4-(4-chlorobenzyl)-5-(4H-1,2,4-triazol-3-yl)-1,3-thiazol-2-yl]-2-methylpyrazolo[1,5-a]pyridine-5-carbaldehyde (0.0563 g, 0.109 mmol), tert-butyl 1-piperazinecarboxylate (60.8 mg, 0.326 mmol) and acetic acid (0.0800 mL, 1.41 mmol) in dry methylene chloride (10 mL) was stirred at rt for 15 min. Sodium triacetoxyborohydride (69.1 mg, 0.326 mmol) was added and the mixture was stirred at rt for 15 hours. The mixture was washed with saturated NaHCO3 solution and the aqueous layer was extracted with DCM. The DCM extract was washed with water, brine, dried over Na2SO4, filtered and evaporated to give a crude product which was purified by column chromatography on silica gel column using MeOH/DCM (0/100 to 5/95) to give solid product (0.0464 g, yield 70.5%). LCMS: (FA) ES+ 605, 607; ES− 603, 605. 1H NMR (400 MHz, CDCl3 and d4-methanol) δ: 8.23-8.25 (d, J=7.03 Hz, 1H), 8.20 (s, 1H), 7.94 (s, 1H), 7.29-7.31 (d, J=8.28 Hz, 2H), 7.15-7.17 (d, J=8.53 Hz, 2H), 6.86-6.89 (dd, J=7.28, 1.76 Hz, 1H), 4.53 (s, 2H), 3.45 (s, 2H), 3.33-3.36 (m, 4H), 2.62 (s, 3H), 2.35 (s, br, 4H), 1.37 (s, 9H).

Workup

  1. stirringthe mixture was stirred at rt for 15 hours
  2. washThe mixture was washed with saturated NaHCO3 solution
  3. extractionthe aqueous layer was extracted with DCM
  4. extractionThe DCM extract
  5. washwas washed with water, brine
  6. dry with materialdried over Na2SO4
  7. filtrationfiltered
  8. customevaporated
  9. customto give a crude product which
  10. customwas purified by column chromatography on silica gel column

Sources & evidence

ORD record
ord-0453aa016be147faae316d1138b7e42a
Source dataset
uspto-grants-2014_08
Patent number
US08796271B2

Reaction notes

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