4'-tert-Butyldimethylsilyl-6-hydroxy Raloxifene

4'-tert-Butyldimethylsilyl-6-hydroxy Raloxifene (Compound 4) is a reaction product of Raloxifene with tertbutyldimethylsilyl chloride. 4'-tert-Butyldimethylsilyl-6-hydroxy Raloxifene is used to synthesize Raloxifene 6-glucuronide[1].

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The preparation of the Raloxifene 6-glucuronide includes: (a) reaction of Raloxifene with tertbutyldimethylsilyl chloride to give a chromatographically separable mixture of Compound 3 and 4'-tert-Butyldimethylsilyl-6-hydroxy Raloxifene (Compound 4); (b) Lewis acid mediated coupling of phenol 4'-tert-Butyldimethylsilyl-6-hydroxy Raloxifene with methyl1,2,3,4-tetra-O-acetyl-D-glucopyranuronate to provide a single product (Compound 6) with the desired flstereochemistry at the anomeric center; (c) heating Compound 6 with lithium hydroxide in dioxane to 60°C, followed by deprotection with tetrabutylammonium fluoride to give Raloxifene 6-glucuronide[1].

[1]. Dodge JA, et al. Evaluation of the major metabolites of raloxifene as modulators of tissue selectivity. J Steroid Biochem Mol Biol. 1997 Apr;61(1-2):97-106.