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Intramolecular trans-ketalization

The desired cyclization leading to the six-membered ring was achieved by intramolecular photocycloaddition of dioxolenone 107 as shown in Scheme 26. Consecutive cleavage of the ketal followed by retroaldol reaction augmented the initial ring system by a C2 unit to trans-bicycle 108 (90). Attempts to apply this reaction principle to a trans-decalin system in order to reach a taxane skeleton failed (97). [Pg.223]

See other pages where Intramolecular trans-ketalization is mentioned: [Pg.41] [Pg.57] [Pg.41] [Pg.57] [Pg.307] [Pg.1198] [Pg.48] [Pg.76] [Pg.122] [Pg.24] [Pg.1198] [Pg.363] [Pg.122] [Pg.191] [Pg.310]

See also in sourсe #XX -- [ Pg.10 , Pg.211 ]