3,5-Dimesityl-1,2,4-oxadiphosphole – Synthesis and Reactivity of a Novel Heterocycle
作者:Andreas Mack、Uwe Bergsträßer、Guido J. Reiß、Manfred Regitz
DOI:10.1002/(sici)1099-0690(199903)1999:3<587::aid-ejoc587>3.0.co;2-3
日期:1999.3
1,2,4-oxadiphosphole 6 has been achieved by vacuum thermolysis of mesitylphosphaalkene 5. The novel heterocycle 6 exhibits an enormous potential for cycloaddition reactions, which predominantly proceed selectively at low temperatures. Compound 6 undergoes addition with two equivalents of phosphaalkynes 10 by a [4+2] cycloaddition/homo Diels–Alder reaction sequence to form novel oxatetraphosphadeltacyclenes
1,2,4-恶二磷6的第一次合成已经通过异亚丙基磷烯5的真空热解来实现。新型杂环6对于环加成反应显示出巨大的潜力,其主要在低温下选择性地进行。化合物6通过[4 + 2]环加成/同位Diels-Alder反应序列与两个当量的磷炔烃10进行加成反应,从而形成新的草酸酯四磷杂环戊烯环12和13。四氯邻苯醌(14)与12和13进行选择性的[4 + 1]环加成反应导致螺产品15和16的含λ 5 -磷原子。用乙炔二羧酸二甲酯(17)处理恶二磷6,可首先获得1,2-恶磷18,后者是在最初的[4 + 2]环加成反应后进行的逆Diels-Alder反应形成的。在三叔丁基氮杂环丁烷(20)提供了新的多环体系(21)时,观察到了意外的6反应。