Observation of a Thermally Induced Bora-Nazarov Cyclization at a Phosphole Framework
作者:Juri Möbus、Gerald Kehr、Constantin G. Daniliuc、Christian Mück-Lichtenfeld、Gerhard Erker
DOI:10.1002/anie.201502850
日期:2015.10.12
electrophilic borane reagents RB(C6F5)2 (R=C6F5, CH2CH2Ph, CH3) gave phospholes cleanly in a 1,1‐carboboration reaction sequence. Depending on the steric bulk, the resulting 2,5‐alkenylphospholes underwent a thermally induced bora‐Nazarov type cyclization. The equilibrium situation of these examples of a bora‐Nazarov type cyclization was investigated in detail by NMR spectroscopy, X‐ray crystal structure
双(enynyl)的反应膦6,b与亲电硼烷试剂ř B(C 6 ˚F 5)2(R = C 6 ˚F 5,CH 2 CH 2 PH,CH 3)在一个干净,得到phospholes 1,1-碳化作用的反应顺序。根据空间大小,所得的2,5-烯基磷脂经历了热诱导的bora-Nazarov型环化反应。通过NMR光谱,X射线晶体结构分析和DFT计算,详细研究了bora-Nazarov型环化反应这些例子的平衡态。