Tetrahedron p. 3753 - 3772 (1991)
Update date:2022-08-04
Topics:
Hedtmann, Udo
Klintz, Ralf
Hobert, Kurt
Frelek, Jadwiga
Vlahov, Iontscho
Welzel, Peter
A flexible approach to ecdysteroids, chain elongated at C-26 and C-27, is reported. Key features are the addition of 5-lithio 2,3-dihydrofurans (3) to poststeron (10) and a stereoselective reduction of the 22-∞ group.
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