Ethyl orthoformate → (S)-5-[3-(1,2,4-oxadiazol-3-yl)phenyl]-9-methylthio-1,2,3,3a,4,5-hexahydro-5,8,10,10b-tetraazabenzo[e]azulen-6-one

HRID 1672799Notes

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](OCC)(OCC)OCC>>[O:1]1[CH:28]=[N:27][C:3]([C:4]2[CH:5]=[C:6]([N:10]3[CH2:19][C@H:18]4[N:14]([CH2:15][CH2:16][CH2:17]4)[C:13]4[N:20]=[C:21]([S:24][CH3:25])[N:22]=[CH:23][C:12]=4[C:11]3=[O:26])[CH:7]=[CH:8][CH:9]=2)=[N:2]1

Participants

Reactant 2

HCID 31214Ethyl orthoformate

HCID 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 67349324(S)-5-[3-(1,2,4-oxadiazol-3-yl)phenyl]-9-methylthio-1,2,3,3a,4,5-hexahydro-5,8,10,10b-tetraazabenzo[e]azulen-6-oneYield 78%

Conditions

Temperature: 80 °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 (180 mg, 0.47 mmol) obtained in Step 1 of Example 75 was suspended in triethyl orthoformate (6.0 mL), and the mixture was stirred at 80° C. for 2 days. The residue obtained by concentrating the mixture under reduced pressure was then purified by silica gel column chromatography to give (S)-5-[3-(1,2,4-oxadiazol-3-yl)phenyl]-9-methylthio-1,2,3,3a,4,5-hexahydro-5,8,10,10b-tetraazabenzo[e]azulen-6-one (144 mg, 78%).

Workup

customThe residue obtained
concentrationby concentrating the mixture under reduced pressure
customwas then purified by silica gel column chromatography

Sources & evidence

ORD record: ord-82583fdf604548f6b2f84469afc95873
Source dataset: uspto-grants-2011_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07998954B2

Reaction notes

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