process, which involves a two-step sequence of reactions on-water, is a regioselective hetero-Diels–Alder cycloaddition reaction of enol ethers to 4-phosphinyl or 4-phosphonyl nitroso alkenes mediated by water itself. The process has also been performed under solvent-free conditions and in organic solvents for comparison.
已经开发了由次膦酰基-和膦酰基-亚硝基的烯烃简明而环保的合成高度官能化的1,2-恶嗪。此过程的关键步骤涉及两步
水上反应,这是烯醇醚与
水本身介导的区域选择性异Diels-Alder环加成反应,使烯醇醚生成4-膦酰基或4-膦酰基亚硝基烯烃。为了进行比较,该过程也已在无溶剂条件下和有机溶剂中进行。