Chloromethyl formate → (S)-3-[3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)phenyl]-1,2,4-oxadiazol-5(4H)-one

HRID 1672806Notes

Reaction equation

HRID 1672806 reaction equation
[OH:1][N:2]=[C:3]([NH2:27])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([N:10]2[CH2:19][C@H:18]3[N:14]([CH2:15][CH2:16][CH2:17]3)[C:13]3[N:20]=[C:21]([S:24][CH3:25])[N:22]=[CH:23][C:12]=3[C:11]2=[O:26])[CH:5]=1.[CH:28](OCCl)=[O:29]>N1C=CC=CC=1.C(Cl)(Cl)Cl>[CH3:25][S:24][C:21]1[N:22]=[CH:23][C:12]2[C:11](=[O:26])[N:10]([C:6]3[CH:5]=[C:4]([C:3]4[NH:27][C:28](=[O:29])[O:1][N:2]=4)[CH:9]=[CH:8][CH:7]=3)[CH2:19][C@H:18]3[N:14]([CH2:15][CH2:16][CH2:17]3)[C:13]=2[N:20]=1

Participants

5

Reactant 2

HCID 17803410Chloromethyl formateHCID 86643699(S)-N'-hydroxy-3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)benzamidine

Product 1

HCID 136337081(S)-3-[3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)phenyl]-1,2,4-oxadiazol-5(4H)-oneYield 110.6%

Reagents, catalysts & solvents 2

HCID 1049PyridineSolventHCID 6212ChloroformSolvent

Conditions

Temperature
90 °C

Procedure

(S)—N′-hydroxy-3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)benzamidine (200 mg, 0.52 mmol) obtained in Step 1 of Example 75 was dissolved in pyridine (3.0 mL), and the mixture was stirred at 90° C. for 4 hours after adding chloromethyl formate (0.12 mL, 1.56 mmol) under ice-cooled conditions. The mixture was diluted with chloroform, washed with water and saturated brine, and the organic layer was dried over anhydrous magnesium sulfate. The residue obtained by concentrating the mixture under reduced pressure was then purified by silica gel column chromatography to give (S)-3-[3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)phenyl]-1,2,4-oxadiazol-5(4H)-one (236 mg, quantitative).

Workup

  1. temperaturecooled conditions
  2. washwashed with water and saturated brine
  3. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
  4. customThe residue obtained
  5. concentrationby concentrating the mixture under reduced pressure
  6. customwas then purified by silica gel column chromatography

Sources & evidence

ORD record
ord-581021d28afb45bda5cd9537a0cc0752
Source dataset
uspto-grants-2011_08
Patent number
US07998954B2

Reaction notes

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