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

HRID 1447487Notes

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

Participants

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

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

Sources & evidence

ORD record: ord-d3314abebb2641e5825f6bdd807ce6e8
Source dataset: uspto-grants-1982_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04316985

Reaction notes

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