A new strategy for construction of angularly fused tricyclic ring systems. Transannular bond formation of bicyclic enones via photochemical intramolecular hydrogen abstraction
Tricyclic ketones 3a, b and 7a–c having angularly fused 5-6-5 or 5-7-5 ring system have been efficiently prepared by irradiation of bicyclic enones 1 and 2.
Provided are analgesic compounds, and salts thereof, of formula: (I) wherein A is: (A) Additionally, pharmaceutical formulations and methods of use employing the above compounds are provided.
提供的是镇痛化合物及其盐,化学式如下:(I) 其中 A 是:(A) 此外,还提供了使用上述化合物的药物配方和使用方法。
Efficient Process for Preparing Steroids and Vitamin D Derivatives With the Unnatural Configuration at C20 (20 Alpha-Methyl) from Pregnenolone
申请人:Bridges Alexander James
公开号:US20080171728A1
公开(公告)日:2008-07-17
Disclosed herein are methods for preparing steroids and Vitamin D derivatives having the unnatural beta (usually S) configuration at C20, the methods comprising the use of compounds of the formula:
wherein R is as defined herein. Also disclosed are steroids and Vitamin D derivatives made using the methods disclosed herein and pharmaceutical compositions comprising said steroids and Vitamin D derivatives.
Process for the synthesis of vitamin d compounds and intermediates for the synthesis of the compounds
申请人:Kashiwagi Hirotaka
公开号:US20070135394A1
公开(公告)日:2007-06-14
An object of the present invention is to provide a process for synthesizing a vitamin D compound by simple procedures at lower costs. The present invention provides a process for preparing a vitamin D compound and an intermediate thereof, comprising the step of: (a) mixing a ketone or aldehyde, a Wittig reagent, and a base; or (b) mixing a ketone or aldehyde and a Wittig reagent, and then adding a base to the resulting mixture.