Iodine → tert-butyl(1-(5-((5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)cyclopropyl)methylcarbamate

HRID 1855591Notes

Reaction equation

HRID 1855591 reaction equation
CCN(CC)CC.II.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.[C:29]([O:33][C:34](=[O:63])[NH:35][CH2:36][C:37]1([C:40]([NH:42][NH:43][C:44]([CH:46]2[CH2:52][CH2:51][C@@H:50]3[CH2:53][N:47]2[C:48](=[O:62])[N:49]3[O:54][CH2:55][C:56]2[CH:61]=[CH:60][CH:59]=[CH:58][CH:57]=2)=O)=[O:41])[CH2:39][CH2:38]1)([CH3:32])([CH3:31])[CH3:30]>C(Cl)Cl>[CH2:55]([O:54][N:49]1[C:48](=[O:62])[N:47]2[CH2:53][C@H:50]1[CH2:51][CH2:52][CH:46]2[C:44]1[O:41][C:40]([C:37]2([CH2:36][NH:35][C:34](=[O:63])[O:33][C:29]([CH3:32])([CH3:31])[CH3:30])[CH2:38][CH2:39]2)=[N:42][N:43]=1)[C:56]1[CH:61]=[CH:60][CH:59]=[CH:58][CH:57]=1

Participants

6

Reactant 4

HCID 807IodineHCID 8471TriethylamineHCID 11776TriphenylphosphineHCID 131732351tert-butyl(1-(2-((5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinecarbonyl)cyclopropyl)methylcarbamate

Product 1

HCID 86701028tert-butyl(1-(5-((5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)cyclopropyl)methylcarbamateYield 83.1%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Et3N (8.3 g, 0.082 mol) was added to a 0° C. solution of I2 (10.43 g, 0.041 mol), PPh3 (10.76 g, 0.041 mol) in CH2Cl2 (250 mL). The mixture was allowed to warm to rt. After stirring at rt for 0.5 hr, tert-butyl(1-(2-((5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinecarbonyl)cyclopropyl)methylcarbamate (10 g, 0.0205 mol) was added. The mixture was stirred at rt for another 1 hr. The mixture was concentrated, EtOAc (250 mL) was added, and the mixture was filtered to remove Ph3PO. The filtrate was concentrated and the residue was purified by silica gel column chromatography (gradient elution 33-50% EtOAc/petroleum ether) to afford tert-butyl (1-(5-((5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)cyclopropyl)methylcarbamate (8 g, 83%) as a white solid. ESI-MS (EI+, m/z): 470.3 [M+H]+.

Workup

  1. stirringThe mixture was stirred at rt for another 1 hr
  2. concentrationThe mixture was concentrated
  3. additionEtOAc (250 mL) was added
  4. filtrationthe mixture was filtered
  5. customto remove Ph3PO
  6. concentrationThe filtrate was concentrated
  7. customthe residue was purified by silica gel column chromatography (gradient elution 33-50% EtOAc/petroleum ether)

Sources & evidence

ORD record
ord-af520c44d2f64c6b843d10c41af2fc84
Source dataset
uspto-grants-2015_02
Patent number
US08962844B2

Reaction notes

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