Synthesis of bicyclelactones 4 - 6, potential precursors to trichothecenes is described. These incorporate the cis AB ring juncture and double bond in proper position in ring A. Luche reduction of 7 followed by hydrolysis furnished lactone 9. Reaction of 7 with MeMgl and subsequent hydrolysis led to lactone 11 and was transformed to 4. Reduction of 14 and hydrolysis produced pyran carboxylic acid
Synthetic method for a chiral 3-(substituted-phenyl)-4-(3-hydroxypropyl)-cyclohexanol
申请人:PFIZER INC.
公开号:EP0118244A2
公开(公告)日:1984-09-12
Racemic endo- and exo-1-methoxybicyclo[2.2.2]oct-5- ene-2-carboxylic acids are starting materials for a novel and efficient synthesis of chiral 3R-[2-hydroxy-4-(1,1-dimethylheptyl)phenyl]-4R-(3-hydroxypropyl)-1R-cyclohexanol, a compound having valuable central nervous system (CNS) activity, particularly as an analgesic and as an antiemetic.