Tetrahydrofuran → (3beta,5beta,15alpha,16alpha)-15,16-Dihydro-3,5-dihydroxy-3'H-cycloprop(15,16)androsta-6,15-dien-17-one

HRID 65416

Reaction equation

HRID 65416 reaction equation
Cl[C@@H:2]1[C@H:19]2[O:20][C@:18]32[C@:13]([CH3:22])([CH2:14][CH2:15][C@H:16]([OH:21])[CH2:17]3)[C@@H:12]2[C@@H:3]1[C@H:4]1[C@@:8]([CH2:10][CH2:11]2)([CH3:9])[C:7](=[O:23])[C@H:6]2[CH2:24][C@@H:5]12.O1CCCC1>C(O)(=O)C.[Zn]>[OH:21][C@H:16]1[CH2:15][CH2:14][C@@:13]2([CH3:22])[C@:18]([OH:20])([CH:19]=[CH:2][C@@H:3]3[C@@H:12]2[CH2:11][CH2:10][C@@:8]2([CH3:9])[C@H:4]3[C@@H:5]3[CH2:24][C@@H:6]3[C:7]2=[O:23])[CH2:17]1

Participants

5

Reactant 2

HCID 8028TetrahydrofuranHCID 130759667alpha-Chloro-5,6beta-epoxy-3beta-hydroxy-15beta,16beta-methylene-5beta-androstan-17-one

Product 1

HCID 13075974(3beta,5beta,15alpha,16alpha)-15,16-Dihydro-3,5-dihydroxy-3'H-cycloprop(15,16)androsta-6,15-dien-17-oneYield 94.4%

Reagents, catalysts & solvents 2

HCID 23994ZincCatalystHCID 176Acetic AcidSolvent

Procedure

107.5 g of 7α-chloro-5,6β-epoxy-3β-hydroxy-15β,16β-methylene-5β-androstan-17-one is dissolved in 500 ml of acetic acid and 500 ml of tetrahydrofuran and, after the addition of 324 g of zinc dust in three portions, stirred at room temperature for 16 hours. The zinc is then filtered off, the filtrate is diluted with methylene chloride, and washed with sodium bicarbonate solution and water. After drying over sodium sulfate, the product is concentrated under vacuum. By trituration of the thus-obtained solid with ethyl acetate, 91.5 g of 3β,5-dihydroxy-15β,16β-methylene-5β-androst-6-en-17-one is produced, mp 196° C.

Workup

  1. filtrationThe zinc is then filtered off
  2. additionthe filtrate is diluted with methylene chloride
  3. washwashed with sodium bicarbonate solution and water
  4. dry with materialAfter drying over sodium sulfate
  5. concentrationthe product is concentrated under vacuum

Sources & evidence

ORD record
ord-4f6f033bf183440a905cf0a17ebf7a0c
Source dataset
uspto-grants-1986_09
Patent number
US04614616

Linked notes

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