摘要
首先以廉价易得的非金属硒作催化剂,CO替代剧毒光气作羰基化试剂,O2作氧化剂,通过硒催化苯胺与醇"一锅煮"的氧化羰基化反应制得苯氨基甲酸酯;然后在HCl/ZnCl_2催化下再与甲醛缩合制得二苯甲烷二氨基甲酸酯.两反应的目标产物收率从中等到良好,底物普遍适用性广.CO利用率及原子经济性高,且避免了剧毒光气的使用.催化剂硒具有相转移催化作用,便于回收且能循环使用.合成方法清洁、经济、高效.提出了可能的反应机理.
A clean, economical and efficient approach to phenylcarbamates and methylene diphenyl dicarbamates was reported. With cheap and easily available nonmetal selenium as the catalyst, carbon monoxide instead of virulent phosgene as the carbonylation reagent, oxygen as the oxidant, the selenium-catalyzed oxidative carbonylation reaction of aniline could proceed smoothly with alcohols to afford phenylcarbamates mostly in moderate to good yields. Then, catalyzed by HCl/ZnCl2, the condensation of formaldehyde with the generated phenylcarbamates gave methylene diphenyl dicarbamates in moderate to good yields. The applicability of the substrates was good. Catalyst selenium could be easily recovered due to its function of phase-transfer catalysis and could be recycled. High atomic economy, low cost, no emission of corrosive waste, and phosgene-free condition make this approach very promising. The possible reaction mechanisms were also proposed.
作者
张晓鹏
荆唤芝
彭惟于
李亚芳
范学森
张贵生
Zhang Xiaopeng Jing Huanzhi Peng Weiyu Li Yafang Fan Xuesen Zhang Guisheng(Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 45300)
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2017年第2期411-417,共7页
Chinese Journal of Organic Chemistry
基金
河南省高校科技创新团队支持计划(No.15IRTSTHN003)
河南省高等学校青年骨干教师(No.2013GGJS-059)
河南师范大学青年骨干教师(No.2011-8)资助项目~~
