Double- and Triple-Consecutive O-Insertion into <i>tert</i>-Butyl and Triarylmethyl Structures
作者:Pavel A. Krasutsky、Igor V. Kolomitsyn、Sergiy G. Krasutsky、Paul Kiprof
DOI:10.1021/ol049171p
日期:2004.7.1
concecutive Criegee rearrangement reactions were studied for tert-butyl trifluoroacetate, triarylcarbinols, and benzophenone ketales with trifluoroperacetic acid (TFPAA) in trifluoroacetic acid (TFA). The formation of methyl acetate and methyl trifluoroacetate indicates that the consecutive double-O-insertion process has taken place for tert-butyl trifluoroacetate. The intermediate dimethoxymethylcarbonium
[反应:参见正文]研究了连续的Criegee重排反应,涉及三氟乙酸叔丁酯,三芳基甲醇和二苯甲酮酮与三氟过氧乙酸(TFPAA)在三氟乙酸(TFA)中的反应。乙酸甲酯和三氟乙酸甲酯的形成表明三氟乙酸叔丁酯已经进行了连续的双O插入过程。在低于5摄氏度的温度下检测到中间体二甲氧基甲基碳离子。对于三芳基甲醇和二苯甲酮缩酮,已经观察到连续的三次O插入过程。开发了相应的碳酸二芳基酯合成的新的高收率方法。