trans-1,2-Diacetoxy-1,2-dihydrobenzocyclobutene → Rac-3'-acetoxy-3'-acetyl-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro-[1,3-dithiolane-2,1'-naphthacene]

HRID 1074673Notes

Reaction equation

HRID 1074673 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.[C:17]([O:20][C:21]1([C:37](=[O:39])[CH3:38])[CH2:30][C:29]2[C:28](=[O:31])[CH:27]=[CH:26][C:25](=[O:32])[C:24]=2[C:23]2([S:36][CH2:35][CH2:34][S:33]2)[CH2:22]1)(=[O:19])[CH3:18]>C1(C)C(C)=CC=CC=1>[C:17]([O:20][C:21]1([C:37](=[O:39])[CH3:38])[CH2:30][C:29]2[C:28](=[O:31])[C:27]3[C:26](=[CH:6][C:7]4[C:8]([CH:5]=3)=[CH:9][CH:10]=[CH:11][CH:12]=4)[C:25](=[O:32])[C:24]=2[C:23]2([S:36][CH2:35][CH2:34][S:33]2)[CH2:22]1)(=[O:19])[CH3:18]

Participants

4

Reactant 2

HCID 13264175trans-1,2-Diacetoxy-1,2-dihydrobenzocyclobuteneHCID 20283284Rac-3'-acetoxy-3'-acetyl-1',2',3',4',5',8'-hexahydro-5',8'-dioxospiro[1,3-dithiolane-2,1'-naphthalene]

Product 1

HCID 20283303Rac-3'-acetoxy-3'-acetyl-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro-[1,3-dithiolane-2,1'-naphthacene]Yield 82%

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

A mixture of 0.825 g (0.00375 mol) of trans-1,2-diacetoxy-1,2-dihydrobenzocyclobutene and 1.20 g (0.0034 mol) of rac-3'-acetoxy-3'-acetyl-1',2',3',4',5',8'-hexahydro-5',8'-dioxospiro[1,3-dithiolane-2,1'-naphthalene] [prepared as described in Example 5(A)] in 65 ml of xylene was stirred and heated under reflux under an atmosphere of nitrogen for 16 hours. The solution was evaporated to dryness and the residue was stirred with 20 ml of diethyl ether and filtered to give 1.259 g (82%) of rac-3'-acetoxy-3'-acetyl-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro[1,3-dithiolane-2,1'-naphthacene] in the form of a bright yellow solid of melting point 239°-241° C.

Workup

  1. temperatureheated
  2. temperatureunder reflux under an atmosphere of nitrogen for 16 hours
  3. customThe solution was evaporated to dryness
  4. stirringthe residue was stirred with 20 ml of diethyl ether
  5. filtrationfiltered

Sources & evidence

ORD record
ord-9c84e01e1487478da521850fae9a4e0f
Source dataset
uspto-grants-1983_07
Patent number
US04393221

Reaction notes

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