Cross-coupling of 1,1-difluoro-1-en-3-yn-2-yl tosylates with arylboronic acids: A new approach to 2-aryl-1,1-difluoro-1,3-enynes
作者:Su Jin Kim、Hyun Gyu Ryu、Sung Lan Jeon、In Howa Jeong
DOI:10.1016/j.jfluchem.2016.08.014
日期:2017.4
The palladium-catalyzed direct alkynylation of 2,2-difluoro-1-tributylstannylethenyl p-toluenesulfonate 1 with alkynyl bromides provided the corresponding 1,1-difluoro-1,3-enynyl tosylates 2 in good yields. The Suzuki-Miyaura arylation reaction of 2 with arylboronicacids afforded the cross-coupled products, 2-aryl-1,1-difluoro-1,3-enynes 3, in good yields.
Cu(I)-Catalyzed Cross-Coupling of Terminal Alkynes with Trifluoromethyl Ketone <i>N</i>-Tosylhydrazones: Access to 1,1-Difluoro-1,3-enynes
作者:Zhikun Zhang、Qi Zhou、Weizhi Yu、Tianjiao Li、Guojiao Wu、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.5b00980
日期:2015.5.15
elimination have been achieved in a Cu(I)-catalyzed cross-coupling reaction of terminal alkynes and trifluoromethyl ketone N-tosylhydrazones. The reaction represents an efficient synthesis of 1,1-difluoro-1,3-enyne derivatives. Mechanistically, the migratory insertion of the copper carbene intermediate leads to the C–C bond formation, which is followed by C–F bond cleavage.
Cu(I)-Catalyzed Three-Component Coupling of Trifluoromethyl Ketone<i>N</i>-Tosylhydrazones, Alkynes and Azides: Synthesis of Difluoromethylene Substituted 1,2,3-Triazoles
作者:Zhikun Zhang、Qi Zhou、Weizhi Yu、Tianjiao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/cjoc.201600888
日期:2017.4
A CuI‐catalyzedthree‐component coupling of trifluoromethyl ketone N‐tosylhydrazones, alkynes and azides has been developed. The reactionrepresents a straightforward method to access difluoromethylene substituted 1,2,3‐triazoles. Mechanistically, it has been proposed that the reaction follows a pathway involving the formation of Cu(I)triazolide intermediate, Cu(I) carbene formation, migratory insertion
An efficient method for the synthesis of gem-difluoroolefins
作者:Chun-Ru Cao、Song Ou、Min Jiang、Jin-Tao Liu
DOI:10.1016/j.tetlet.2016.12.070
日期:2017.2
A series of gem-difluoroolefin derivatives were synthesized in moderate to good yields by the reaction of α,α-difluoro-β-carbonyl benzothiazol-2-yl sulfones (DFBTs) with various carbon nucleophiles. Using dl-proline as organocatalyst, the reaction of DFBT with acetone gave a tertiary alcohol, which could be further converted to the corresponding difluoroolefin by LDA.