Synthetic Photochemistry. LIV. The Photoaddition Reaction of Methyl 2,4-Dioxopentanoate with 2,5-Dimethyl-2,4-hexadiene, a Sterically Crowded Conjugated Diene
作者:Toshihide Hatsui、Chitoshi Nojima、Hitoshi Takeshita
DOI:10.1246/bcsj.63.1611
日期:1990.6
The photoaddition reaction of methyl 2,4-dioxopentanoate with 2,5-dimethyl-2,4-haxadiene gave a normal [2+2]adduct in only a small amount, but three isomeric dihydropyrans (4–6), two oxetanes (7 and 8), and five isomeric hydroxy keto esters (9–13). The mechanism and regioselectivity were discussed.
2,4-二氧代戊酸甲酯与 2,5-二甲基-2,4-己二烯的光加成反应仅产生少量正常的 [2+2] 加合物,但产生三种异构二氢吡喃 (4-6)、两种氧杂环丁烷 ( 7 和 8),以及五种异构羟基酮酯 (9-13)。讨论了机理和区域选择性。