Journal of the Chemical Society. Chemical communications p. 342 - 344 (1988)
Update date:2022-08-02
Topics:
Ibuka, Toshiro
Taga, Tooru
Nishii, Shinji
Yamamoto, Yoshinori
Reaction of (E)-ethyl 3β-t-butyldimethylsiloxypregna-5,17-dien-21-oate with lithium di-isopropylamide followed by alkyl halides results in the predominant formation of (20S)-alkylation products in >88percent isolated yields; a synthetic application to both (20R)- and (20S)-steroidal side chains is also described.
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