B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Hydrodesulfurization Using Hydrosilanes – Metal-Free Reduction of Sulfides
作者:Kodai Saito、Kazumi Kondo、Takahiko Akiyama
DOI:10.1021/acs.orglett.5b01651
日期:2015.7.2
B(C6F5)3-catalyzed hydrodesulfurization of carbon–sulfur bonds was achieved using triethylsilane as the reducing agent. The corresponding products were obtained in good yields under mild reaction conditions. This protocol could be applied to the reduction of sulfides, including benzyl and alkyl sulfides and dithianes, with high chemoselectivities.
使用三乙基硅烷作为还原剂,实现了B(C 6 F 5)3催化的碳硫键加氢脱硫。在温和的反应条件下以高收率获得了相应的产物。该方案可用于具有高化学选择性的硫化物的还原,包括苄基和烷基硫化物以及二噻烷。
Highly Efficient Regeneration of Carbonyl Compounds from Oximes, Tosylhydrazones, 1,3-Dithiolanes, and 1,3-Dithianes Using Cupric Nitrate Supported on Silica Gel
作者:Jong Gun Lee、Je Pil Hwang
DOI:10.1246/cl.1995.507
日期:1995.7
Cupric nitrate supported in silica gel is exceptionally efficient in regenerating aldehydes and ketonesfrom oximes, tosylhydrazones, 1,3-dithiolanes, and 1,3-dithianes.
A novel metal‐free process allowing the reductive desulfurization of various benzylicdithioketals to afford diarylmethane and benzylester derivatives with good to excellent yields is reported. At room temperature, this mild reduction process requires only the use of TMSCl and NaI in CH2Cl2 and tolerates a large variety of functional groups.
The chemistry of molecules containing sulfur attracts continuous attention as a consequence of the potential biological activity of this class of compounds (1). For example, tiapamil is an antianginal agent used in the treatment of angina pectoris (2). The protection of carbonyl functionality as a dithioacetal or a thioketal is an important tool in the multistep total synthesis of complex natural and
Dithioacetals can be deprotected to afford carbonyl groups using the tantalum(V) chloride catalyzed oxidation of iodide ion by hydrogen peroxide under mild conditions.