Visible light photocatalytic decarboxylative monofluoroalkenylation of α-amino acids with gem-difluoroalkenes
作者:Jingjing Li、Quentin Lefebvre、Haijun Yang、Yufen Zhao、Hua Fu
DOI:10.1039/c7cc05758j
日期:——
A novel, efficient and general visible-light photocatalytic decarboxylative monofluoroalkenylation of N-protected α-amino acids with gem-difluoroalkenes is reported, affording the corresponding α-amino monofluoroalkenes.
salts has rendered the products easily isolable, which greatly improved the synthetic practicality of the monodefluoroborylation reaction. Stoichiometric experiments indicate that the fate of the regioselectivity depends on the mode of β-fluorine elimination, which depends on the substrate. Further transformation of the boryl group has allowed facile preparation of fluoroalkene derivatives as exemplified
reported. By taking advantage of the in situ generated α-CF3-benzylsilver intermediates derivedfrom the nucleophilic addition of silver fluoride to gem-difluoroalkenes, this strategy bypasses the use of a strong base, thus enabling a mild and general synthetic method for ready access to non-symmetric α,α-disubstituted trifluoroethane derivatives.
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.
which otherwise are essentially reluctant towards F‐nucleoplilic addition, now readily participate in this fluoroallylation reaction. Furthermore, this strategy provides an elegant example for the generation, as well as functionalization, of α‐CF3‐substituted benzylic radical intermediates using cheap and readily available starting materials.