The reaction of 4-(1,3,2-benzodioxaphosphol-2-yloxy)-3-tert-butylpent-4-en-2-one with hexafluoroacetone
作者:Vladimir F. Mironov、Tamara A. Baronova、Mudaris N. Dimukhametov、Robert R. Fayzullin、Igor A. Litvinov
DOI:10.1016/j.mencom.2019.09.009
日期:2019.9
unexpectedly occurs with elimination of proton from the methyl group and leads to vinyloxyphosphole derivative, viz., 4-(1,3,2-benzodioxaphosphol-2-yloxy)-3-tert-butylpent-4-en-2-one. Its reaction with hexafluoroacetone gives a cage phosphorane as a result of subsequent chemoselective [4 + 2]- and [3 + 2]-cycloadditions with stereoselectivity above 95%.
叔丁基乙酰丙酮被2-氯-1,3,2-苯并二恶唑磷脂催化(ZnCl2,Et3N)磷酸化会意外地发生,从而使质子从甲基中消除,并生成乙烯基氧磷衍生物,即4-(1,3,2) -苯并二氧杂膦基-2-基氧基)-3-叔丁基戊-4-烯-2-酮。由于随后的立体选择性高于95%的化学选择[4 + 2]-和[3 + 2]-环加成反应,其与六氟丙酮的反应生成了笼状膦烷。