Zusammenfassung Reaction of allyltrimethylsilane (Sakurai reaction) with steroidal 3-oxo-4, 6-dienes catalized by titanium tetrachloride has been investigated. In contrast to the analogous conjugate addition of alkylmagnesium halides catalized by copper (I) chloride only the 7α-substituted derivatives are formed.
![(7R,8R,9S,10R,13S,14S,17R)-7-allyl-10,13-dimethyl-1,3',4',6,7,8,9,10,11,12,13,14,15,16-tetradecahydro-5'H-spiro[cyclopenta[a]phenanthrene-17,2'-furan]-3,5'(2H)-dione结构式](https://image.chemsrc.com/caspic/284/76685-44-4.png)
