Improved efficiency and product selectivity in the photo-Claisen-type rearrangement of an aryl naphthylmethyl ether using a microreactor/flow system
作者:Hajime Maeda、Satoshi Nashihara、Hirofumi Mukae、Yasuharu Yoshimi、Kazuhiko Mizuno
DOI:10.1007/s11164-012-0650-6
日期:2013.1
Ultraviolet (UV) irradiation of 2-[(2,4,6-trimethylphenoxy)methyl]-1-(methoxycarbonyl)naphthalene promotes a photochemical reaction that gives a cyclohexa-2,4-dienone product arising from a photo-Claisen-type ortho-rearrangement and a phenol derivative arising from a meta-rearrangement, along with 1-methoxycarbonyl-2-methylnaphthalene and 1,2-bis[1-(methoxycarbonyl)naphthalen-2-yl]ethane. When this process is carried out in a microreactor/flow system, its efficiency is dramatically enhanced and selectivity of products is improved. The effects on efficiency and product selectivity caused by the microreactor/flow system are attributed to more efficient light absorption and the suppression of secondary reactions.
紫外线(UV)辐射2-[(2,4,6-三甲基苯氧基)甲基]-1-(甲氧基羰基)萘可促进光化学反应,生成来自光-克莱森型邻位重排的环己-2,4-二烯酮产物、来自间位重排的酚衍生物,以及1-甲氧基羰基-2-甲基萘和1,2-双[1-(甲氧基羰基)萘-2-基]乙烷。当该过程在微反应器/流动系统中进行时,其效率显著提高,产物选择性得到改善。微反应器/流动系统对效率和产物选择性的影响归因于更有效的光吸收和次级反应的抑制。