Diisopropylethylamine → Tert-butyl 7-[5-[bis(tert-butoxycarbonyl)amino]-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3,7-diazaspiro[4.4]nonane-3-carboxylate

HRID 1959448Notes

Reaction equation

HRID 1959448 reaction equation
Br[C:2]1[N:3]=[C:4]([C:23]2[O:24][C:25]([C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)=[N:26][N:27]=2)[C:5]([N:8]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[N:6][CH:7]=1.[CH2:34]1[C:38]2([CH2:42][CH2:41][NH:40][CH2:39]2)[CH2:37][N:36]([C:43]([O:45][C:46]([CH3:49])([CH3:48])[CH3:47])=[O:44])[CH2:35]1.CCN(C(C)C)C(C)C>CN(C=O)C.CCOC(C)=O>[C:11]([O:10][C:9]([N:8]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:5]1[N:6]=[CH:7][C:2]([N:40]2[CH2:41][CH2:42][C:38]3([CH2:34][CH2:35][N:36]([C:43]([O:45][C:46]([CH3:47])([CH3:48])[CH3:49])=[O:44])[CH2:37]3)[CH2:39]2)=[N:3][C:4]=1[C:23]1[O:24][C:25]([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)=[N:26][N:27]=1)=[O:15])([CH3:14])([CH3:13])[CH3:12]

Participants

6

Reactant 3

HCID 81531DiisopropylethylamineHCID 23282813tert-Butyl 2,7-diazaspiro[4.4]nonane-2-carboxylateHCID 59471994Tert-butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate

Product 1

HCID 66744439Tert-butyl 7-[5-[bis(tert-butoxycarbonyl)amino]-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3,7-diazaspiro[4.4]nonane-3-carboxylateYield 62%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of tert-butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (70 mg, 0.14 mmol), tert-butyl 3,7-diazaspiro[4.4]nonane-3-carboxylate (31 mg, 0.14 mmol) and DIEA (35 mg, 47 μL, 0.27 mmol) in DMF (1 mL) was heated at 90° C. for 2 h. The reaction mixture was allowed to cool to room temperature and diluted with EtOAc. The organic layer was washed with brine (2×), dried over Na2SO4, filtered and concentrated under reduced pressure. The crude material was purified by flash chromatography using 0-35% EtOAc in hexanes to yield tert-butyl 7-[5-[bis(tert-butoxycarbonyl)amino]-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3,7-diazaspiro[4.4]nonane-3-carboxylate (56 mg, 62%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 8.15-8.04 (m, 3H), 7.71-7.60 (m, J=7.5 Hz, 3H), 3.74-3.62 (m, 2H), 3.59-3.53 (m, 2H), 3.39 (s, 2H), 2.89 (s, 1H), 2.73 (s, 1H), 2.10-1.99 (m, 2H), 1.98-1.84 (m, 2H), 1.41 (d, J=7.3 Hz, 9H), 1.29 (s, 18H). LC/MS m/z 664.7 [M+H]+.

Workup

  1. temperatureto cool to room temperature
  2. washThe organic layer was washed with brine (2×)
  3. dry with materialdried over Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe crude material was purified by flash chromatography

Sources & evidence

ORD record
ord-22de952bfef2461da36c9b48313022c5
Source dataset
uspto-grants-2013_04
Patent number
US08410112B2

Reaction notes

Loading…