Optimization of Grignard ring-opening of α-brominated dioxolanes for the preparation of β-hydroxy-protected vinyl ethers by a three-step one-pot procedure
作者:Mathieu André、Boris Letribot、Martine Bayle、Emmanuelle Mounetou、Jean-Michel Chezal
DOI:10.1016/j.tetlet.2012.08.144
日期:2012.11
Aliphatic, cyclic, and aromatic benzoate-protected γ-hydroxy enol ethers were prepared from α-brominated dioxolanes by a three-step reaction procedure and a one-pot protocol involving Grignard reagent formation, ring-opening, and final benzoate protection. Additionally, tert-butyldiphenylsilyl, acetate, and 4,4′-dimethoxytrityl were also successfully used as alternative protecting groups.
脂族,环状和芳族苯甲酸酯保护的γ-羟基烯醇醚是通过三步反应程序和涉及格氏试剂形成,开环和最终苯甲酸酯保护的一锅法从α-溴化二氧戊环制备的。另外,叔丁基二苯基甲硅烷基,乙酸盐和4,4'-二甲氧基三苯甲基也被成功地用作替代的保护基。