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Dihydrotestosterone (2.6 mmol) was dissolved in anhydrous methylene chloride (3 mL) and triethylamine (2.6 mmol) under argon. The solution was stirred at 0° C. for 30 minutes at which time chloroacetyl chloride (3.75 mmol) dissolved in anhydrous methylene chloride (2 mL) was added. The resulting mixture was stirred for an additional 30 min at 0° C. and at room temperature for 4 hr. The solution was diluted with CH2 Cl2 (30 mL) and was washed with aqueous 0.05N hydrochloric acid (2×30 mL) and water (2×30 mL). The organic layer was dried over sodium sulfate and evaporated under vacuum to give crude product as a white solid. The product was purified by silica gel column chromatography (Davisil grade 633, 200-425 mesh, 60 Å) using CHCl3 as eluent. Yield, 0.38 g (41%); mp 135°-136° C. (lit. Ferguson et al., J. Chem. Soc., Perkin II, 3, 267-272 (1978)), 138° C.); 1H NMR δ0.78 (s, 3 H, CH3 -19), 0.98 (s, 3 H, CH3 -18), 0.78-2.49 (m, 22 H), 4.37 (d, 2 H, CH2Cl), 4.62 (t, 1 H, H-17); MS (EI) calcd m/z for C21H31O335Cl 366.1961, found, 366.1932; calcd. m/z for C21H31O337Cl 368.1932, found, 368.1911.

1. additionwas added
2. washwas washed with aqueous 0.05N hydrochloric acid (2×30 mL) and water (2×30 mL)
3. dry with materialThe organic layer was dried over sodium sulfate
4. customevaporated under vacuum
5. customto give crude product as a white solid
6. customThe product was purified by silica gel column chromatography (Davisil grade 633, 200-425 mesh, 60 Å)
7. customYield