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- W2066962953 abstract "The preparation of selectively protected derivatives of the title diol ( III ) is described. Derivatives with protected hydroxyl in position 3 ( IV, V and VI ) were obtained by p -toluenesulfonic acid-catalyzed reaction of etienic acid ( I ) with dihydropyran, ethyl vinyl ether and methyl vinyl ether, respectively, and subsequent hydride reduction. The protection of the free primary hydroxyl in these compounds and the subsequent removal of the acetal protecting group in position 3 represents a suitable approach to 20-protected derivatives. The relative rates of cleavage of the acetal protecting groups and reaction conditions are discussed." @default.
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- W2066962953 date "1990-01-01" @default.
- W2066962953 modified "2023-10-02" @default.
- W2066962953 title "Preparation of selectively protected derivatives of 21-nor-5-pregnene-3β,20-diol" @default.
- W2066962953 doi "https://doi.org/10.1135/cccc19900499" @default.
- W2066962953 hasPublicationYear "1990" @default.
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