Substituent Effects on the Iodine-Catalyzed Thermal Cyclization of 3,4-Diphenylbuta-1,3-dienyl Isocyanates: Mechanistic Studies
作者:Ta-Hsien Chuang、Wei-Yu Chang、Chien-Fu Li、Yu-Chia Wen、Chia-Chen Tsai
DOI:10.1021/jo2017247
日期:2011.12.2
The thermal cyclization of 3,4-diphenylbuta-1,3-dienyl isocyanates 1, generated in situ from the corresponding azides, was investigated using iodine as a catalyst. Diphenylpyridinones 2, phenylnaphthalenes 3, and indenes 4 were produced via intramolecular ring closure. The nature of the substituents on the phenyl rings was found to be crucial to the distribution of cyclized products 2–4. The mechanism
使用碘作为催化剂,研究了由相应的叠氮化物就地生成的3,4-二苯基丁-1,3-二烯基异氰酸酯1的热环化反应。经由分子内环闭合产生二苯基吡啶酮2,苯基萘3和茚满4。在苯环上具有取代基的性质被认为是到环化产物的分布至关重要2 - 4。还讨论了反应机理。