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Sodium Hydroxide → Methyl rac-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylate

HRID 463469
Notes
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Reaction equation

HRID 463469 reaction equation
C(O[CH:5]1[C:22]2[C:17](=[CH:18][CH:19]=[CH:20][CH:21]=2)[CH:16](OC(=O)C)[CH:15]2[CH:6]1[C:7](=[O:36])[C:8]1[C:9]3([S:35][CH2:34][CH2:33][S:32]3)[CH2:10][CH:11]([C:28]([O:30][CH3:31])=[O:29])[CH2:12][C:13]=1[C:14]2=[O:27])(=O)C.[OH-].[Na+]>CO.O>[O:36]=[C:7]1[C:6]2[C:15](=[CH:16][C:17]3[C:22]([CH:5]=2)=[CH:21][CH:20]=[CH:19][CH:18]=3)[C:14](=[O:27])[C:13]2[CH2:12][CH:11]([C:28]([O:30][CH3:31])=[O:29])[CH2:10][C:9]3([S:32][CH2:33][CH2:34][S:35]3)[C:8]1=2
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 2

HCID 14798Sodium HydroxideHCID 20283276Methyl rac-1',2',3',4',5',5a',6',11',11a',12'-decahydro-6',11'-diacetoxy-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylate

Product 1

HCID 20283279Methyl rac-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylateYield 73.1%

Reagents, catalysts & solvents 2

HCID 887MethanolSolvent
HCID 962
Water
Solvent

Conditions

Temperature
20 °C

Procedure

A mixture of 26.5 mg (0.05 mmol) of methyl rac-1',2',3',4',5',5a',6',11',11a',12'-decahydro-6',11'-diacetoxy-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylate and 5 mg (0.125 mmol) of sodium hydroxide in 2 ml of methanol was stirred at 20° C. for 1.5 hours. The mixture was then diluted with 10 ml of water and extracted with two 10 ml portions of dichloromethane. The combined dichloromethane extracts were washed with 10 ml of water, dried over magnesium sulphate and evaporated to dryness to give 15 mg (73%) of methyl rac-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylate in the form of a bright yellow solid of melting point 216° C.

Workup

  1. extractionextracted with two 10 ml portions of dichloromethane
  2. washThe combined dichloromethane extracts were washed with 10 ml of water
  3. dry with materialdried over magnesium sulphate
  4. customevaporated to dryness

Sources & evidence

ORD record
ord-ae8383f5c8c84c12a12777d3a6a3c28e
Source dataset
uspto-grants-1985_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04518784

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes