p-Toluenesulfonic acid → HCID 67576705, compound

Participants

Reaction Steps

10 g of 11β-(4-methoxyphenyl)-4-oestrene-3,17-dione are placed in a mixture of 260 ml of absolute methylene chloride, 29 ml of ethanol and 26.4 ml of orthoformic acid triethyl ester and, at 0° C., 100 mg of p-toluenesulphonic acid (monohydrate) are added. The whole is then stirred for 3.5 hours at ice-bath temperature and then an excess of saturated sodium hydrogen carbonate solution is added to the reaction mixture. The aqueous phase is extracted repeatedly with methylene chloride and the combined organic phases are dried over sodium sulphate and concentrated in vacuo. The crude product is used directly in the subsequent reaction step. 10.8 g of crude 3-ethoxy-11β-(4-methoxyphenyl)-3,5-oestradien-17-one are isolated.

Provenance & Evidence