Mechanism of the Color Reaction of Deoxycorticosterone with Sulfuric Acid

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概要

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• The mechanism of the color reaction of deoxycorticosterone (1) with sulfuric acid was elucidated. Two rearranged products, 13ξ(or 14ξ)-hydroxy-17β-methyl-18-nor-13ξ, 14ξ, 17α-pregn-4-ene-3,20-dione (4) and 17β-methyl-18-nor-17α-pregna-4,13-diene-3,20-dione (5), were isolated from the reaction mixture of 1 with 97% sulfuric acid at room temperature in 46 and 32% yields, respectively. Proton nuclear magnetic resonance (^1H-HMR) spectra of 97% sulfuric acid solutions of 1,4 and 5 revealed that they are present in the acid as the diprotonated form (7) of 5,showing an absorption maximum at 288 nm. The acid solution of 7 was heated for 90 min at 60℃ to give two intermediary species (x-372 and x-436) showing maxiama at 372 and 436 nm, respectively. Dilution of the mixture with ethanol reduced these species and produced a new chromophore (x-600) showing a maximum at 600 nm. From the diluted solution, 17-isopropyl-18-norandrosta-4,6,8(14), 13(17)-tetraen-3-one (13) was isolated in 13% yield. Dissolution of 13 in a 2 : 3 mixture of sulfuric acid and ethanol immediately gave x-600,which was identified from its ^1H-NMR data as the steroidal carbocation (14) having a hydroxyalkatetraenyl cation moiety. On the other hand, dissolution of 13 in 90% sulfuric acid gave x-372,which was shown to be in acid-base equilibrium with x-600. x-372 was also identified from its ^1H-NMR data as the dication (15) having a hydroxyalkenyl cation moiety in ring A and an Alkadienyl cation moiety across rings B, C and D.

• 社団法人日本薬学会の論文
• 1986-04-25

著者

• 三浦 敏明

  Faculty Of Pharmaceutical Sciences Hokkaido University

• 木村 道也

  Faculty of Pharmaceutical Sciences, Hokkaido University

• 高木 英利

  Faculty of Pharmaceutical Sciences, Hokkaido University

• 曽根田 智子

  Faculty of Pharmaceutical Sciences, Hokkaido University

• 高木 英利

  Faculty Of Pharmaceutical Sciences Hokkaido University

• 曽根田 智子

  Faculty Of Pharmaceutical Sciences Hokkaido University

• 木村 道也

  Faculty Of Pharmaceutical Sciences Hokkaido University

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