Various diarylboron chelates of the cyclic B,N-betaine type (2, 7, 11) are synthesized from N-(2-hydroxyalkyl)-N,N-dialkylamine-N-oxides (1) and diarylboron reagents. They are rearranged in a thermally induced intramolecular redox reaction, during which the N-oxide is deoxygenated and the borinic acid moiety is oxidized to the state of boronic acid. The rearrangement products 3, 8 and 12 are converted
环状的各种二芳基
硼酸螯合物B,N -betaine型(2,7,11)从合成ñ - (2-羟烷基) - N,N- -dialkylamine- Ñ -oxides(1)和二芳基
硼酸试剂。它们在热诱导的分子内
氧化还原反应中重排,在此期间,N-
氧化物被
脱氧,而
硼酸部分则被
氧化成
硼酸状态。通过与N-
氧化物(1)再螯合,将重排产物3、8和12转化为新的B,N-
甜菜碱型螯合物5和9。