The Michaelreaction of various nitroalkanes 1 with electrophilic alkenes 2 can be performed in NaOH (0.025−0.1 M), without any organic solvent. In many cases the presence of cetyltrimethylammonium chloride (CTACl), as cationic surfactant, produces better results. Good yields of the products 3 are obtained even with hindered, and functionalized starting materials.
A New Synthesis of <b><i>exo</i></b>-Methylene Butyrolactones from Nitroalkanes
作者:Roberto Ballini、Giovanna Bosica、Damiana Livi
DOI:10.1055/s-2001-16098
日期:——
A versatile route to exo-methylene butyrolactones was developed by employing a three step reaction sequence consisting of Michael addition of primary nitroalkanes 1 to ethyl (2-bromomethyl)acrylate (2), then Nef conversion of the nitro derivatives 3, and subsequent lactonization of the obtained keto esters 4. The method is chemoselective for important functionalities such as ester, C=C double bond and hydroxyl.