cyclobutene-containing spiro[2.3]hexenes fused with six or seven-membered carbo- or hetero-cycles in good to excellent yields following a thermal induced intramolecular [2+2] cycloaddition of alkynone-vinylidenecyclopropanes or a sequential oxidation/thermal induced intramolecular [2+2] cycloaddition process of propynol-vinylidenecyclopropanes under metal-free conditions.
已经开发出一种高效且高度区域选择性的合成方法,用于制备新型的与六或七元碳环或杂环稠合的含
环丁烯的螺环[2.3]己烯,在热诱导的分子内[2 + 2]后得到良好或优异的收率。炔炔-亚
乙烯基环丙烷的环加成反应或在无
金属条件下
丙炔-亚
乙烯基环丙烷的顺序氧化/热诱导的分子内[2 + 2]环内加成过程。