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ChemicalBook CAS DataBase List Exemestane Impurity 11
107868-36-0

Exemestane Impurity 11 synthesis

1synthesis methods
Androst-1-ene-3,17-dione, 4,5-epoxy-6-methylene- (9CI)

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Exemestane Impurity 11

107868-36-0
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-

Yield:-

Reaction Conditions:

with hydrogenchloride in acetic acid;

Steps:

3 EXAMPLE 3

EXAMPLE 3 A solution of 4,5-epoxy-6-methylenandrost-1-ene-3,17-dione (1.0 g) in glacial acetic acid (10 ml) was treated with gaseous hydrogen chloride for 30 min at room temperature The precipitate was filtered off, washed with diethyl ether, dried and chromatographed on silica gel using hexane/ethyl acetate to yield 0.8 g of pure 4-chloro-6-methylenandrosta-1,4-diene-3,17-dione. Found: C 72.40, H 6.91, Cl 10.53; C20 H23 ClO2 requires: C 72.61, H 7.01, Cl 10.72. N.M.R. δp.p.m.: 0.84 (3H, s); 1.24 (3H, s); 5.13 (1H, s); 5.43 (1H, s); 6.37 (1H, d); 7.08 (1H, d). MS (m/z): 330.

References:

US4808616,1989,A

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