trans-1,2-Diacetoxy-1,2-dihydrobenzocyclobutene → Methyl rac-1,2,3,4,5,12-hexahydro-5,12-dioxonaphthacene-2-carboxylate

HRID 1074671Notes

Reaction equation

HRID 1074671 reaction equation
C(O[C@@H:5]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[C@H:6]1OC(=O)C)(=O)C.[O:17]=[C:18]1[CH:27]=[CH:26][C:25](=[O:28])[C:24]2[CH2:23][CH:22]([C:29]([O:31][CH3:32])=[O:30])[CH2:21][CH2:20][C:19]1=2>C1(C)C(C)=CC=CC=1>[O:17]=[C:18]1[C:27]2[C:26](=[CH:6][C:7]3[C:8]([CH:5]=2)=[CH:9][CH:10]=[CH:11][CH:12]=3)[C:25](=[O:28])[C:24]2[CH2:23][CH:22]([C:29]([O:31][CH3:32])=[O:30])[CH2:21][CH2:20][C:19]1=2

Participants

4

Reactant 2

HCID 13264175trans-1,2-Diacetoxy-1,2-dihydrobenzocyclobuteneHCID 20283297Methyl rac-1,2,3,4,5,8-hexahydro-5,8-dioxonaphthalene-2-carboxylate

Product 1

HCID 20283275Methyl rac-1,2,3,4,5,12-hexahydro-5,12-dioxonaphthacene-2-carboxylateYield 81.2%

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

A mixture of 240 mg (1.1 mmol) of trans-1,2-diacetoxy-1,2-dihydrobenzocyclobutene and 220 mg (1.0 mmol) of methyl rac-1,2,3,4,5,8-hexahydro-5,8-dioxonaphthalene-2-carboxylate in 20 ml of dry xylene was stirred and heated under reflux under an atmosphere of nitrogen for 18 hours. The solution was evaporated to dryness, the yellow residue was stirred with 10 ml of diethyl ether and the mixture was subsequently filtered to give 260 mg (81%) of methyl rac-1,2,3,4,5,12-hexahydro-5,12-dioxonaphthacene-2-carboxylate in the form of a bright yellow solid of melting point 173°-174° C.

Workup

  1. temperatureheated
  2. temperatureunder reflux under an atmosphere of nitrogen for 18 hours
  3. customThe solution was evaporated to dryness
  4. stirringthe yellow residue was stirred with 10 ml of diethyl ether
  5. filtrationthe mixture was subsequently filtered

Sources & evidence

ORD record
ord-19aa3f2c8846478b89a93479a60d6672
Source dataset
uspto-grants-1983_07
Patent number
US04393221

Reaction notes

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