Water → 3alpha,20-Dihydroxy-20-methyl-5alpha-pregnane

To a stirred mixture of 3α-acetoxy-5α-pregnan-20-one (120 mg, 360.5 g/m, 0.32 mmol) in 25 mL of dry benzene, was added 4.6 mL of 3M methylmagnesium bromide dropwise. After the addition of methylmagnesium bromide was completed, the reaction mixture was allowed to stir at room temperature for 18 h and then refluxed for 2 h. The excess methylmagnesium bromide was decomposed by dropwise addition of 30 mL of saturated ammonium chloride solution in an ice bath. The solution product was poured into water and extracted with chloroform twice. The extracts were dried over magnesium sulfate and evaporated to give 110 mg of crude product. The product was recrystallized in methanol to give 83 mg of 3α,20-dihydroxy-20-methyl-5α-pregnane.

1. temperaturerefluxed for 2 h
2. extractionextracted with chloroform twice
3. dry with materialThe extracts were dried over magnesium sulfate
4. customevaporated
5. customto give 110 mg of crude product
6. customThe product was recrystallized in methanol

ORD-Eintrag

ord-3ec9cf050ad24e30a7d6276f0cbfc06e

Quelldatensatz

uspto-grants-1993_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05232917