3-Nitrobenzaldehyde → Methyl 3,4,5,8,-tetrahydro-6-methyl-8-(3-nitrophenyl)-1,1-dioxo-2H-thiopyrano-[3,2-b]pyridine-7-carboxylate

HRID 867940Notes

Reaction equation

HRID 867940 reaction equation
[S:1]1(=[O:9])(=[O:8])[CH2:6][CH2:5][CH2:4][C:3](=O)[CH2:2]1.[N+:10]([C:13]1[CH:14]=[C:15]([CH:18]=[CH:19][CH:20]=1)[CH:16]=O)([O-:12])=[O:11].[NH2:21]/[C:22](/[CH3:28])=[CH:23]\[C:24]([O:26][CH3:27])=[O:25]>CO>[CH3:28][C:22]1[NH:21][C:3]2[CH2:4][CH2:5][CH2:6][S:1](=[O:9])(=[O:8])[C:2]=2[CH:16]([C:15]2[CH:18]=[CH:19][CH:20]=[C:13]([N+:10]([O-:12])=[O:11])[CH:14]=2)[C:23]=1[C:24]([O:26][CH3:27])=[O:25]

Participants

5

Reactant 3

HCID 74493-NitrobenzaldehydeHCID 643918Methyl 3-aminocrotonateHCID 11815935Dihydro-2H-thiopyran-3(4H)-one-1,1-dioxide

Product 1

HCID 14011211Methyl 3,4,5,8,-tetrahydro-6-methyl-8-(3-nitrophenyl)-1,1-dioxo-2H-thiopyrano-[3,2-b]pyridine-7-carboxylateYield 29.3%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of tetrahydrothiopyran-3-one-1,1-dioxide (0.830 g, 0.0056 moles), 3-nitrobenzaldehyde (0.846 g, 0.0056 moles) and methyl 3-aminocrotonate (0.644 g, 0.0056 moles) in methanol (20 mL) was refluxed for 16 hours. After cooling, the resulting solid was isolated by filtration and washed with diethyl ether. This solid was dried at 40° C. for 4 hours under vacuum to give 0.620 g product; mp 236°-238° C.

Workup

  1. temperaturewas refluxed for 16 hours
  2. temperatureAfter cooling
  3. customthe resulting solid was isolated by filtration
  4. washwashed with diethyl ether
  5. customThis solid was dried at 40° C. for 4 hours under vacuum

Sources & evidence

ORD record
ord-c7def32d3da34981ab880187f49f848e
Source dataset
uspto-grants-1988_10
Patent number
US04777167

Reaction notes

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