Hindered organoboron groups in organic chemistry. 23. The interactions of dimesitylboron stabilised carbanions with aromatic ketones and aldehydes to give alkenes.
作者:Andrew Pelter、Dieter Buss、Eamon Colclough、Bakthan Singaram
DOI:10.1016/s0040-4020(01)87981-3
日期:1993.8
Dimesitylboron stabilised carbanions react with diarylketones to give the corresponding alkenes in mild conditions with good yields. Reactions with aromatic aldehydes are more complex, but in all cases E-alkenes are available in good yields by trapping the intermediates with chlorotrimethylsilane followed by treatment with aq. HF/CH3CN. Treatment of the same intermediates with trifluoroacetic anhydride
Dimesitylboron稳定的碳负离子与二芳基酮反应,在温和的条件下以良好的收率得到相应的烯烃。与芳族醛的反应更复杂,但是在所有情况下,通过用氯三甲基硅烷捕获中间体,然后用碳酸氢钠水溶液处理,可以以高收率获得E-烯烃。HF / CH 3 CN。用三氟乙酸酐处理相同的中间体主要得到Z-烯烃。考虑了这些重要过程的设计和机制。