Реакция #55612

Уравнение реакции

hydrochloric acid

potassium hydroxide

methyl 4-androsten-3-one-17β-carboxylate

water

→

4-androsten-3-one-17β-carboxylic acid

Выход 98.0%

Растворители

methanol

Условия реакции

Обработка

1. 1
   ТемператураThe reaction mixture was refluxed under nitrogen for 6 hours
2. 2
   ДругоеMost of the product crystallized as fine crystals
3. 3
   workup.ADDITIONof water was added in a stream over 30 minutes
4. 4
   Другоеwhich precipitated all of the product
5. 5
   ФильтрацияThe mixture was filtered on a cap funnel
6. 6
   Промывкаwashed with water until the wash water showed neutral
7. 7
   ДругоеThe product was dried in an oven at 50° C. overnight
8. 8
   Другоеwas obtained in 98% yield (2.313 g.)

Методика

To 2.462 kg. of methyl 4-androsten-3-one-17β-carboxylate in 24.6 l of methanol was added 1.23 kg. of potassium hydroxide in 4.9 l. of water. The reaction mixture was refluxed under nitrogen for 6 hours, and then allowed to cool to room temperature overnight. The mixture was acidified with 3200 ml. of 6 N hydrochloric acid. Most of the product crystallized as fine crystals. Then, 14 l. of water was added in a stream over 30 minutes, which precipitated all of the product. The mixture was aged with stirring for 4 hours at 30° C. The mixture was filtered on a cap funnel and washed with water until the wash water showed neutral. The product was dried in an oven at 50° C. overnight. The product, having a m.p. of 245°-248° C., was obtained in 98% yield (2.313 g.).

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