Triethylamine → (S,S)-5-[4-(Benzothiazol-2-yloxy)-benzyl]-2,5-diaza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester

HRID 545592Notes

Reaction equation

HRID 545592 reaction equation
Cl[CH2:2][C:3]1[CH:18]=[CH:17][C:6]([O:7][C:8]2[S:9][C:10]3[CH:16]=[CH:15][CH:14]=[CH:13][C:11]=3[N:12]=2)=[CH:5][CH:4]=1.[C:19]([O:23][C:24]([N:26]1[CH2:31][C@@H:30]2[CH2:32][C@H:27]1[CH2:28][NH:29]2)=[O:25])([CH3:22])([CH3:21])[CH3:20].C(N(CC)CC)C>CC#N>[C:19]([O:23][C:24]([N:26]1[CH2:31][C@@H:30]2[CH2:32][C@H:27]1[CH2:28][N:29]2[CH2:2][C:3]1[CH:18]=[CH:17][C:6]([O:7][C:8]2[S:9][C:10]3[CH:16]=[CH:15][CH:14]=[CH:13][C:11]=3[N:12]=2)=[CH:5][CH:4]=1)=[O:25])([CH3:22])([CH3:20])[CH3:21]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 11521263(1S,4S)-2-Boc-2,5-diazabicyclo[2.2.1]heptaneHCID 67207884HCID 67207884, compound

Product 1

HCID 67206277(S,S)-5-[4-(Benzothiazol-2-yloxy)-benzyl]-2,5-diaza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl esterYield 71.1%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a stirred solution of 2-(4-chloromethyl-phenoxy)-benzothiazole (15.3 g, 55.3 mmol) and (S,S)-2,5-diaza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (13.2 g, 66.4 mmol) in CH3CN (200 mL) was added triethylamine (Et3N) (11.5 mL, 82.9 mmol). The resulting solution was stirred at rt for 24 h and then concentrated. The crude residue was then partitioned between CH2Cl2 (800 mL) and saturated (satd.) aqueous (aq.) NaHCO3 (200 mL). The organic layer was separated, dried (Na2SO4), filtered and concentrated. Purification by silica gel flash chromatography (10% to 40% ethyl acetate (EtOAc) in hexanes) afforded the title compound as a white foam (17.2 g, 71%). MS (ESI): mass calcd. for C24H27N3O3S, 437.18; m/z found, 438.2 [M+H]+. 1H NMR (500 MHz, CDCl3, mixture of rotamers): 7.73 (d, J=7.1 Hz, 1H), 7.66 (d, J=7.1 Hz, 1H), 7.42 (d, J=8.1 Hz, 2H), 7.38 (m, 1H), 7.32-7.24 (br m, 3H), 4.40 (br m, 0.5H), 4.26 (br m, 0.5H), 3.76 (br d, J=9.7 Hz, 2H), 3.63 (br d, J=10.5 Hz, 0.5H), 3.50 (br m, 1H), 3.46 (m, 0.5H), 3.18 (br m, 1H), 2.93 (br d, J=8.8 Hz, 0.5H), 2.88 (br d, J=9.4 Hz, 0.5H), 2.73 (br d, J=9.2 Hz, 0.5H), 2.55 (br d, J=9.2 Hz, 0.5H), 1.87 (br t, J=8.8 Hz, 1H), 1.74 (br d, J=9.3 Hz, 0.5H), 1.68 (br d, J=9.3 Hz, 0.5H), 1.47 (s, 9H).

Workup

  1. concentrationconcentrated
  2. customThe crude residue was then partitioned between CH2Cl2 (800 mL) and saturated (satd.) aqueous (aq.) NaHCO3 (200 mL)
  3. customThe organic layer was separated
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customPurification by silica gel flash chromatography (10% to 40% ethyl acetate (EtOAc) in hexanes)

Sources & evidence

ORD record
ord-3704ae57ba384c05bbacab5a1ff708d5
Source dataset
uspto-grants-2011_05
Patent number
US07935725B2

Reaction notes

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