由B(C醚取代的醇与羰基化合物的化学选择性脱氧6 ˚F 5)3 -催化还原(HME 2 SICH 2)2 †
摘要:
使用(HMe 2 SiCH 2)2作为还原剂,开发了B(C 6 F 5)3催化的醚取代的醇和羰基化合物的脱氧反应。这种独特的试剂显示出优于传统的以硅为中心的氢硅烷的独特优势,可高收率地提供相应的烷烃,并对醚,芳基卤化物和烯烃具有良好的耐受性。对照实验表明(HMe 2 SiCH 2)2可能以分子内Si / O活化方式促进该方法。
A remarkable solvent effect toward the Pd/C-catalyzed cleavage of silyl ethersElectronic supplementary information (ESI) available: characterization data and references and supplementary Tables 4 and 5. See http://www.rsc.org/suppdata/cc/b2/b211313a/
Direct conversion of alcohol silyl ethers into the corresponding diphenylmethyl (DPM) ethers can be easily performed by the reaction with diphenylmethyl formate in the presence of a catalytic amount of trimethylsilyl trifluoromethanesulfonate. By the additional use of triethylsilane, tetrahydropyranylethers can be also converted into the corresponding DPM ethers.
Chemoselective and Practical Deprotection of Alkyl Trialkylsilyl Ethers in the Presence of Aryl Trialkylsilyl Ethers by a Catalytic Amount of Sc(OTf)<sub>3</sub>
Treatment of alkyl trialkylsilyl ethers with 0.5 mol% of Sc(OTf)3 combined with 5 equivalents of water in acetonitrile provides an efficient and practical method for the deprotection of silyl ethers. Alcoholic trialkylsilyl ethers have been cleaved selectively in the presence of phenolic trialkylsilyl ethers.
An Efficient and Convenient Method for the Direct Conversion of Alkyl Silyl Ethers into the Corresponding Alkyl Ethers Catalyzed by Iron(III) Chloride
作者:Takeshi Oriyama、Katsuyuki Iwanami、Kentaro Yano
DOI:10.1055/s-2005-872120
日期:——
Various alcohol silyl ethers were readily and efficiently transformed into the corresponding alkyl ethers in high yields by the use of aldehydes combined with triethylsilane in the presence of a catalytic amount of iron(III) chloride.
alkylindium reagents with diaryliodonium salts proceeded efficiently in the presence of tetrakis(triphenylphosphine)palladium [Pd(PPh3)4], 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (SPhos), lithium tert-butoxide, and lithium chloride in DMA/THF (1:1) at 100 °C, leading to the corresponding cross-coupling products in moderate to good yield with broad substrate scope and wide functional group tolerance