The regioselectivity of nitrone and nitrile oxide cycloadditions to alkylidenecyclopropanes
作者:Alberto Brandi、Franca M. Cordero、Francesco De Sarlo、Remo Gandolfi、Andrea Rastelli、Marisa Bagatti
DOI:10.1016/0040-4020(92)85008-3
日期:1992.1
The 1,3-dipolarcycloaddition of nitrile oxides and a nitrone to alkylidencyclopropanes 1–5,used as model for methylenecyclopropanes substituted with arylgroup (1), electron-releasing groups (2 and 3) and electron-attracting groups (4 and 5) is reported. The cycloaddition to alkylidenecyclopropanes 1–3 gives prevalently or exclusively adducts bearing the cyclopropane ring on the C4 position of the
Regioselectivity in the 1,3-dipolar cycloaddition of nitrile oxides to alkylidenecyclopropanes.
作者:Alberto Brandi、Silvio Carli、Antonio Guarna、Francesco De Sarlo
DOI:10.1016/s0040-4039(00)96402-5
日期:1987.1
The 1,3-dipolarcycloaddition of nitrileoxides to methylenecyclopropanes substituted on the exocyclic double bond gives prevalently or exclusively 4-spirocyclopropane isoxazolines when the substituent is arylic or alkylic group, 5-spirocyclopropane isoxazolines when the substituent is an electron-withdrawing group. Adducts 16 and 17 selectively rearrange photochemically to the enaminoenone 19.