Patent / 1972
The title compds. (I) were prepd. from pregnatriene (II) by treatment with MeCONHBr and aq. HClO4 to give the 9.alpha.-bromo-11.beta.-hydroxy deriv., treatment with NaOH to give the 9,11-epoxy deriv. which was treated with aq. HF to give I (R = H) which could be treated with I-MeOH in the presence of CaO to give the 21-diiodo deriv. which was treated with KOAc, giving I (R = OAc).