Improved synthesis of 1,2,4-triazoline-3,5-dione derivatives of ergosterol and a new method for their reconversion to ergosterol
作者:Derek H.R. Barton、Xavier Lusinchi、Jesús Sandoval Ramírez
DOI:10.1016/s0040-4039(00)88078-8
日期:1983.1
The ergosterol diene system reacts in excellent yield with a series of 4-substituted 1,2,4-triazoline-3,5-diones generated by in situ oxidation of the appropriate hydrazides with phenylseleninic anhydride or phenylseleninic acid. Diaryltelluroxide and diphenylselenoxide are also efficient oxdants. The diene system can be smoothly regenerated by alkaline hydrolysis.
麦角固醇二烯系统以优异的产率与一系列的4-取代的1,2,4-三唑啉-3,5-二酮反应,所述一系列的4-取代的1,2,4-三唑啉-3,5-二酮是通过适当的酰肼与苯硒酸二酐或苯基硒酸的原位氧化而生成的。二芳基四氢呋喃和二苯硒酸也是有效的氧化剂。二烯体系可以通过碱水解而平滑地再生。