Samarium(II)-Mediated Spirocyclization by Intramolecular Aryl Radical Addition onto an Aromatic Ring
作者:Hiroki Iwasaki、Toru Eguchi、Nozomi Tsutsui、Hiroaki Ohno、Tetsuaki Tanaka
DOI:10.1021/jo800656a
日期:2008.9.19
Samarium(II)-mediated spirocyclization by intramolecular addition of aryl radicals onto an aromatic ring was achieved by the reaction of N-(2-iodophenyl)-N-alkylbenzamides with SmI2 in the presence of HMPA, yielding spirocyclic indolin-2-one derivatives. The ether congeners afford spirocyclic benzofuran derivatives in moderate yields by aryl radical addition onto a benzene ring without having an electron-withdrawing
N-(2-碘苯基)-N-烷基苯甲酰胺与SmI2在HMPA存在下反应,通过在芳环上分子内加成芳基,将mar(II)介导的螺环化反应,生成螺环吲哚-2-酮衍生物。醚同类物通过在不具有吸电子基团的情况下将芳基自由基加成到苯环上而以中等收率得到螺环苯并呋喃衍生物。还描述了与其他芳基如萘和吲哚环的反应。