Pyridine → 19-(Triphenylsiloxy)-4-androstene-3,17-dione methanolate

Beteiligte Stoffe

Reaktionsschritte

A solution of 9.0 gm (0.03 mole) of 19-hydroxy-4-androstene-3,17-dione, 11.8 gm (0.04 mole) of triphenylchlorosilane and 9.6 gm (0.12 mole) of pyridine contained in 100 ml of benzene is refluxeed for a period of 18 hours. The resulting suspension is filtered and concentrated in vacuo to a yellow oil. The oil is placed on a silica gel chromatographic column packed in chloroform which is further eluted with chloroform. The chloroform eluant is evaporated to dryness in vacuo and recrystallized from methanol to yield 19-(triphenylsiloxy)-4-androstene-3,17-dione methanolate having a m.p. 100°-2° C., uv max (MeOH) 223 nm (ε30,430), 242 nm (ε17,300).

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