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.
manuscript reports a visible light-mediated organosul-fide catalysis that enables the decarboxylative coupling between simple aliphaticalcohol and tertiary or secondary alkyl carboxylic acid-derived redox active esters to produce a C(sp3)-O-C(sp3) fragment. Results of the coupling using other heteroatom nucleophiles such as water, amides and thiols are also described.
作者:Bing Xu、Ying Lin、Yang Ye、Li Xu、Tian Xie、Xiang-Yang Ye
DOI:10.1039/d1ra08015f
日期:——
conditions, a variety of thioethers are efficiently prepared from readily available benzyl alcohols (primary, secondary, and tertiary) and thiols in the presence of Cu(OTf)2 as the Lewis acid catalysis. This C–S bond formation protocol furnishes exceptional chemoselectivity, and the preliminary mechanism studies show that the reaction should proceed through a Lewis-acid-mediated SN1-type nucleophilic attack
一种新型的铜催化硫醚化反应已被开发出来,可以以中等至优异的产率提供苄基硫醚。在温和且易于操作的条件下,在Cu(OTf) 2作为Lewis酸催化下,由容易获得的苯甲醇(伯醇、仲醇和叔醇)和硫醇有效地制备了多种硫醚。这种C-S键形成方案提供了优异的化学选择性,初步机制研究表明该反应应通过路易斯酸介导的S N 1型对原位形成的碳阳离子的亲核攻击进行。