Synthesis of prazolinones from β-N,N-dimethylhydrazinopropenoates: an example of a thermally induced [1,4] alkyl shift
作者:Xavier Coqueret、Françoise Bourelle-Wargnier、Josselin Chuche、Loic Toupet
DOI:10.1039/c39830001144
日期:——
Gas phase thermolysis of β-N,N-dimethylhdrazinopropenoates (1) provides a new route to pyrazolinones (2) involving a [1,4] methyl shift from nitorgen to carbon in the pyrazolinium ylide intermediates (3); the mechanism is supported by the isolation of ylides (3a,b,e), the structures of (3a) and (3e) being confirmed by X-ray crystallography.
β - N,N-二甲基叠氮丙酸酯(1)的气相热解提供了一条合成吡唑啉酮(2)的新途径,涉及吡唑啉鎓内酯中间体(3)中从氮到碳的[1,4]甲基转移; 该机理由分离出的叶立德(3a,b,e)来支持,(3a)和(3e)的结构通过X射线晶体学证实。