Synthetic Communications p. 3405 - 3413 (1997)
Update date:2022-08-11
Topics:
Cavazza, Marino
Pietra, Francesco
Readily accessible 10-tosyloxycolchicide (1) and LiX (X=Cl or Br or I) in MeOH/BF3·Et2O at reflux give 10-chloro- (2), 10-bromo- (4), or 10-iodocolchicide (5), in good yields. 9-Chloro- (7) and 9-bromoisocolchidide (8) can be similarly obtained from 9-tosyloxyisocolchidide (6) and the method applies also to troponoids.
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Doi:10.1021/jo061239m
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