The development of efficient protocols for the synthesis of gem-difluoroolefins has received increasing attention. Given the ubiquity of hydroxyl group in biologically active molecules and synthetic intermediates, we developed a one-step protocol for the conversions of alcohols into gem-difluoroolefins. The reactions of alcohols with Ph3P+CF2CO2−/Burgess reagent in DMSO occurred smoothly to afford
合成宝石-二氟烯烃的有效方案的开发受到越来越多的关注。考虑到生物活性分子和合成中间体中普遍存在羟基,我们开发了一种将醇类转化为宝石-二氟烯烃的一步方法。的Ph醇的反应3 P + CF 2 CO 2 - / Burgess试剂在DMSO发生顺利,得到最终的产品在较高产率。DMSO不仅是氧化过程所必需的,而且对于通过捕集二氟卡宾来稳定叶立德也很重要。
Palladium-Catalyzed Direct Approach to α-Trifluoromethyl Alcohols by Selective Hydroxylfluorination of <i>gem</i>
-Difluoroalkenes
作者:Bin Zhang、Xiaofei Zhang、Jian Hao、Chunhao Yang
DOI:10.1002/ejoc.201800468
日期:2018.9.30
A mild and efficient synthesis of α‐trifluoromethyl alcohols derivatives was achieved via Pd‐catalyzed selective hydroxylfluorination of gem‐difluoroalkenes using NFSI as the fluoride source.
Nickel-Catalyzed Enantioselective Reductive Aryl Fluoroalkenylation of Alkenes
作者:Teng Ma、Yate Chen、Yuxiu Li、Yuanyuan Ping、Wangqing Kong
DOI:10.1021/acscatal.9b03172
日期:2019.10.4
Enantioselective Ni-catalyzed reductive aryl monofluoroalkenylation of alkenes between aryl bromides and gem-difluoroalkenes has been developed. The reaction proceeding under room temperature and base-free reaction conditions tolerates a wide range of functional groups on both coupling partners. Various synthetically useful oxindoles containing monofluoroalkenyl substituent are obtained in good yields with
Zinc-Mediated Decarboxylative Alkylation of <i>Gem</i>-difluoroalkenes
作者:Liting Yu、Mei-Lin Tang、Chang-Mei Si、Zhi Meng、Yongxi Liang、Jilai Han、Xun Sun
DOI:10.1021/acs.orglett.8b01866
日期:2018.8.3
An efficient and mild zinc-mediated decarboxylative alkylation of gem-difluoroalkenes with N-hydroxyphthalimide (NHP) esters, to give monofluoroalkenes in moderate to excellent yields with high Z-selectivity is reported. The reaction tolerates a broad range of functional groups and can be easily scaled up, which thus may pave the way for its further applications in medicinal chemistry and materials
Metal-Free Access to (<i>E/Z</i>
)-α-Fluorovinyl Phosphorus Compounds from <i>gem</i>
-Difluorostyrenes
作者:Yingyuan Peng、Xiaofei Zhang、Xueyu Qi、Qian He、Bin Zhang、Jian Hao、Chunhao Yang
DOI:10.1002/ejoc.201801602
日期:2019.2.7
A facile and efficient method to synthesize (E/Z)‐α‐fluorovinyl phosphorus compounds from gem‐difluorostyrenes and diphenylphosphine oxide/dialkyl phosphate in the presence of DBU at room temperature was developed. This method may provide a practical and concise route for the synthesis of these phosphorus compounds in material chemistry and drug discovery in the future.