Flavin-Mediated Visible-Light [2+2] Photocycloaddition of Nitrogen- and Sulfur-Containing Dienes
作者:Michael Jirásek、Karolína Straková、Tomáš Neveselý、Eva Svobodová、Zdeňka Rottnerová、Radek Cibulka
DOI:10.1002/ejoc.201601377
日期:2017.4.18
[2+2] Photocycloaddition mediated by 1-butyl-3-methyl-7,8-dimethoxyalloxazine (1) is shown as an effective tool to cyclise ω-phenyl and ω,ω'-diphenyl-4-aza-1,6-heptadienes, with the nitrogen atom protected by acylation or quaternisation, used towards the synthesis of variety of phenyl- and diphenyl-3-azabicyclo[3.2.0]heptanes and their corresponding quaternary salts. Thia-derivatives with the sulfur
[2+2] 1-丁基-3-甲基-7,8-二甲氧基恶嗪 (1) 介导的光环加成反应是环化 ω-苯基和 ω,ω'-diphenyl-4-aza-1,6 的有效工具-庚二烯,其氮原子被酰化或季铵化保护,用于合成各种苯基-和二苯基-3-氮杂双环[3.2.0]庚烷及其相应的季盐。硫原子以砜基团形式存在的硫杂衍生物经历类似的环化。有利地,与先前描述的通过UV光照射提供氮杂双环[3.2.0]庚烷的程序相比,可见光(400nm)用于使用1的环加成。通过合成双环季铵盐 6-苯基氮杂双环 [3.2. 0]已知具有生物活性的庚烷或手性螺铵盐。还发现黄素 1 可提供富电子肉桂基衍生物的高效 E→Z 异构化,以产生富含 Z-异构体的混合物(Z:E 比率高达 77:23)。