Metal-free intramolecular cyclopropanation of alkenes through iodonium ylide methodology
作者:Robert M. Moriarty、Sachin Tyagi、Mark Kinch
DOI:10.1016/j.tet.2010.05.005
日期:2010.7
Intramolecular cyclopropanation of alkenes occurs thermally with iodonium ylides in the absence of conventional metal catalysts such as Rh(II) and Cu(II). In rigid molecular systems conversions are near quantitative. A mechanism is proposed involving formal 2+2 cycloaddition followed by reductive elimination of PhI to yield the cyclopropane.
在没有常规金属催化剂(例如Rh(II)和Cu(II))的情况下,烯烃的分子内环丙烷化会与碘鎓碘化物发生热反应。在刚性分子系统中,转化几乎是定量的。提出了一种机制,包括正式的2 + 2环加成反应,然后还原除去PhI以产生环丙烷。