The configuration of the oxygen-containing substituent in the position 3 of some 4,4-dimethyl-A-homo-4a-androstene derivatives was determined and their epimeric 4a,5-epoxides were prepared. The acid catalysed opening of the 4a,5-epoxide ring in epoxides XV and XXIX with the trans-orientation of the substituent in the position 3 and the epoxide ring afforded the products of 5(0)n participation of the 3-substituent, i.e. 3,5-transannular epoxides XVII and XXX. 3,5-Transannular epoxides XXII, XXXIV and XXXVI were prepared as substances with a potential biological activity.
确定了一些 4,4-二甲基-A-高-4a-雄烯衍生物 3 位含氧取代基的构型,并制备了它们的环氧化物 4a,5-环氧化物。在酸催化下,环氧化物 XV 和 XXIX 中的 4a,5-环氧化物环在 3 位取代基和环氧化物环的反式取向作用下打开,得到了 3-取代基参与的 5(0)n 产物,即 3,5-反式环氧化物 XVII 和 XXX。制备的 3,5-反式环氧化物 XXII、XXXIV 和 XXXVI 具有潜在的生物活性。