An efficient synthesis of tertiary amines from nitriles in aprotic solvents
作者:Jonathan Shares、Jenna Yehl、Amanda Kowalsick、Philip Byers、Michael P. Haaf
DOI:10.1016/j.tetlet.2012.06.044
日期:2012.8
Tertiaryamines are utilized extensively as non-nucleophilic proton scavengers for a number of organic transformations. Herein we report the efficient syntheses of tertiary alkyl aminesfrom their corresponding alkyl nitriles in the presence of a heterogeneous palladium catalyst and a source of dihydrogen in aprotic solvents. The reaction is atom economic, the conditions are mild, and the isolated
Metal-Free Difluoromethylthiolation, Trifluoromethylthiolation, and Perfluoroalkylthiolation with Sodium Difluoromethane- sulfinate, Sodium Trifluoromethanesulfinate or Sodium Perfluoro- alkanesulfinate
A method for direct difluoromethylthiolation of Ar−H bonds is introduced. The stable and easy-to-handle HCF2SO2Na is reduced with (EtO)2P(O)H in the presence of TMSCl to generate HCF2S+ for the regioselective difluoromethylthiolation of aromatic compounds including indoles, pyrroles, and activated benzenes. This method is also applicable for the trifluoromethylthiolation with CF3SO2Na and the perf
介绍了一种直接的二氟甲硫基化Ar-H键的方法。在TMSCl存在下,用(EtO)2 P(O)H还原稳定易处理的HCF 2 SO 2 Na ,生成HCF 2 S +,用于芳香族化合物(包括吲哚,吡咯和活化)的区域选择性二氟甲基硫醇化反应苯。该方法也适用于用芳烃和杂芳烃用CF 3 SO 2 Na进行三氟甲基硫醇化和用R f SO 2 Na进行全氟烷基硫醇化。还讨论了与无金属亲电性氟代烷基硫基化反应相关的反应机理。
Lewis or Brønsted acid-catalysed reaction of propargylic alcohol-tethered alkylidenecyclopropanes with indoles and pyrroles for the preparation of polycyclic compounds tethered with indole or pyrrole motif
作者:Hao-Zhao Wei、Liu-Zhu Yu、Min Shi
DOI:10.1039/c9ob02211b
日期:——
derivatives via the Lewis or Brønsted acid catalysed cascade nucleophilic addition, electronic cyclization, ring-opening rearrangement of propargylic alcohol-tethered alkylidenecyclopropanes with indole and pyrrole derivatives. The reaction exhibited a broad substrate scope and good functional group tolerance under metal-free conditions, affording the desired products in moderate to good yields.
我们开发了一种简便的合成方法,该方法可通过路易斯或布朗斯台德酸催化的级联亲核加成,电子环化,带有炔丙基和吡咯衍生物的炔丙醇系链亚烷基环丙烷的开环重排来访问环戊五烯[ b ]萘衍生物。该反应在无金属的条件下表现出宽泛的底物范围和良好的官能团耐受性,以中等至良好的产率提供了所需的产物。
Reaction of hexafluorothioacetone dimer with indoles, pyrroles, furans and thiophenes
作者:Viacheslav A. Petrov、Rebecca Dooley、Alexander A. Marchione、Will Marshall
DOI:10.1016/j.jfluchem.2015.11.006
日期:2016.2
absence of catalyst unexpectedly resulted in the formation of indoles bearing aC(CF3)2S2CH(CF3)2 group in the 3-position. Pyrrole, 2-Ethyl-1H-pyrrole and 2,4-dimethyl-1H-pyrrole were found to be more reactive toward 1, giving the corresponding 1:1 adducts, while both furan and thiophene were not active toward 1 even at elevated temperature. Activated 2,3-dimethylfuran gave the corresponding 1:1 adduct in
在CsF催化剂存在下,吲哚与2,2,4,4-四(三氟甲基)-1,3-二硫杂环丁烷1的反应导致快速且高收率地形成了带有SCH(CF 3)2基团的吲哚。 3位。在没有催化剂的情况下进行的相同反应出乎意料地导致形成在3-位带有C(CF 3)2 S 2 CH(CF 3)2基团的吲哚。发现吡咯,2-乙基-1H-吡咯和2,4-二甲基-1H-吡咯对1更具反应性,产生相应的1:1加合物,而呋喃和噻吩对1均无活性即使在高温下。活化的2,3-二甲基呋喃,得到相应的1:与反应1加合物1,同时兼具2,5-二甲基呋喃和2,5-二甲基噻反应用1在高温下得到相应的烯产物。