An Efficient Synthesis of<i>cis</i>-Hydroindan-5-ones by Novel Modified de Mayo Reaction Using 2,3-Dihydro-4-pyrones as the Enone Chromophore
作者:Masayuki Sato、Satoshi Sunami、Tomoyuki Kogawa、Chikara Kaneko
DOI:10.1246/cl.1994.2191
日期:1994.12
A de Mayo type cyclobutane ring opening of the photo[2 + 2]cycloadduct derived from 2,3-dihydro-4-pyrones and cyclopentene was effected by heating the adduct under an acid catalysis. The 1,2-disubstituted cyclopentanes thus formed spontaneously underwent intramolecular Michael addition to afford cis-hydroindan-5-ones in satisfactory yields.
衍生自 2,3-二氢-4-吡喃酮和环戊烯的光 [2 + 2] 环加合物的 de Mayo 型环丁烷开环是通过在酸催化下加热加合物来实现的。由此形成的 1,2-二取代环戊烷自发地进行分子内迈克尔加成,以令人满意的产率提供顺式-氢化茚满-5-酮。