Synthesis of Highly Conjugated Arylpropenylidene-1,3-diazin-2-ones via Paterno–Büchi Reaction by Photoreaction of 5-Fluoro-1,3-dimethyluracil with 1-Methoxynaphthalenes
作者:Koh-ichi Seki、Kazuya Aizawa、Tatsuyuki Sugaoi、Masayuki Kimura、Kazue Ohkura
DOI:10.1246/cl.2008.872
日期:2008.8.5
In contrast to photoreactions of 5-fluoro-1,3-dimethyluracil (5-FDMU) with various naphthalenes including 2-methoxynaphthalenes that proceeds in a manner to give ethenoquinazolines through 1,4-cycloaddition, UV-irradiation of a mixture of 5-FDMU and naphthalenes with a methoxy group at C-1 gave rise to the formation of novel cycloadducts, methyl 2-[(1E)-3-(5-fluoro-1,3-dimethyl-2-oxo-1,3-dihydropyrimidin-4-ylidene)prop-1-enyl]benzoates, derived from the novel aromatic Paterno–Büchi type cycloaddition, followed by a concomitant disruption of the initially formed oxetane moiety.
与5-氟-1,3-二甲基尿嘧啶(5-FDMU)与各种萘类化合物(包括2-甲氧基萘)发生反应,形成通过1,4-环加成反应生成的乙烯基喹唑啉相对,5-FDMU与在C-1位有甲氧基的萘类化合物混合物的紫外线辐照反应产生了新型环加合物,甲基2-[(1E)-3-(5-氟-1,3-二甲基-2-氧基-1,3-二氢嘧啶-4-亚基)丙-1-烯基]苯甲酸酯,这些化合物源自新型芳香Paterno–Büchi型环加成反应,随后伴随最初形成的氧杂环部分的破坏。