A Convenient Method for Retro-Cycloaddition of Adducts from Steroidal 5, 7-Dienes and 4-Phenyl-1, 2, 4-triazolidine-3, 5-dione and Application to the Syntheses of …
Y Tachibana
文献索引：Tachibana, Yoji Chemical and Pharmaceutical Bulletin, 1998 , vol. 46, # 9 p. 1454 - 1458
Use of 1, 8-diazabicyclo [5.4. 0] undec-7-ene (DBU) in boiling xylene was found to be a convenient method for the retro-cycloaddition of adducts of 4-phenyl-1, 2, 4-triazolidine-3, 5- dione (PTAD) with steroidal 5, 7-dienes. This process was applied to the syntheses of
