具有仲和叔α-碳原子的烷基胺的加氢脱氮(HDN)(2-戊胺,3-甲基-2-丁胺,3,3-二甲基-2-丁胺,2-甲基环己胺,2-甲基-2-丁胺)在硫化的NiMo / Al 2 O 3上研究了苄胺和相应的烷硫醇的加氢脱硫(HDS)。烷硫醇和二烷基胺是具有二级α-碳原子的胺的HDN中的主要产物,是通过H 2取代胺基而形成的S或烷基胺。烷烃和烯烃是由链烷硫醇的消除和氢解反应形成的副产物,这已通过烷基胺的HDN和相应链烷硫醇的HDS中相似的烯烃/烷烃比得到证实。2-甲基-2-丁胺和苄胺的反应比具有仲α-碳原子的胺反应快得多。甲基丁烯和甲基丁烷是2-甲基-2-丁胺的主要产物,甲苯是苄胺的主要产物。该和2-甲基-2-丁胺的HDN和2-甲基-2-丁硫醇的HDS中不同的甲基丁烯/甲基丁烷比率表明,具有叔α-碳原子的2-甲基-2-丁胺已被活化。苄胺通过E1机理反应。
C-S cross-coupling of aryl halides with alkyl thiols catalyzed by in-situ generated nickel(II) N-heterocyclic carbene complexes
作者:Fang-Jie Guo、Jing Sun、Zhao-Qing Xu、Fritz E. Kühn、Shu-Liang Zang、Ming-Dong Zhou
DOI:10.1016/j.catcom.2017.02.007
日期:2017.6
C-S cross-coupling of aryl halides with alkyl thiols catalyzed by in-situ generated Ni (II) N-heterocyclic carbene (NHC) complexes is investigated. Good to excellent yields can be obtained for a variety of aryl halides when using 5 mol% of the Ni (II)-NHC catalyst and 1.5 eq. of KOtBu. Both the electronic and steric effects of the NHC ligands on the catalytic performance of Ni (II)-NHC, as well as the
Highly Efficient and Chemoselective Tertiary and Secondary Benzylation of Thiols Catalyzed by Indium(III) Triflate
作者:Krzysztof Kuciński、Grzegorz Hreczycho
DOI:10.1002/ejoc.201701007
日期:2017.10.10
We have developed a highly efficient method for the chemoselective nucleophilicsubstitution of tertiary and secondary benzylic alcohols with aliphatic and aromatic thiols in the presence of catalytic amounts of indium(III) triflate under mild conditions. A broad range of unsymmetrical sulfides were synthesized in excellent isolated yields (89–99 %) by using this approach.
P(OEt)3-Mediated Formal S–H Insertion: Reductive Couplings of Isatins with Thiols to Generate 3-Sulfenylated Oxindoles
作者:Dulin Kong、Mingshu Wu、Tiao Huang、Li Liu、Qinghe Wang
DOI:10.1055/s-0040-1707147
日期:2020.9
Abstract A new P(OEt)3-mediated formal S–H bond-insertion reaction of isatins into thiols for the synthesis of valuable 3-sulfenylation oxindoles has been developed. This approach takes advantage of the unique reactivity of Kukhtin–Ramirez adducts to allow direct reductive S–H functionalization with commercially available and bench-stable starting materials.
Palladium-Catalyzed γ-C(sp<sup>3</sup>
)−H Arylation of Thiols by a Detachable Protecting/Directing Group
作者:Likun Jin、Jianchun Wang、Guangbin Dong
DOI:10.1002/anie.201807760
日期:2018.9.17
Reported herein is a palladium‐catalyzed, directed γ‐C(sp3)−Harylation of protected thiols. The key is to utilize Michael acceptors as a dual reagent to install a protecting/directing group on thiols by a thiol‐Michael click reaction, and remove it later under basic conditions. The C−H arylation proceeds with high functional‐group tolerance and the deprotected thiols can be further transformed into