InCl<sub>3</sub>/Me<sub>3</sub>SiBr-Catalyzed Direct Coupling between Silyl Ethers and Enol Acetates
作者:Yoshiharu Onishi、Yoshihiro Nishimoto、Makoto Yasuda、Akio Baba
DOI:10.1021/ol200875m
日期:2011.5.20
A combined Lewis acid catalyst of InCl3 and Me3SiBr promoted the direct use of enol acetates in the coupling with low-reactive silyl ethers, in which functional groups including ketones and aldehydes survived. Sterically hindered silyl ethers such as ROSiEt3, ROSiPh3, ROSit-BuMe2, and ROSii-Pr3 were also applicable.
HF–Pyridine: A Versatile Promoter for Monoacylation/Sulfonylation of Phenolic Diols and for Direct Conversion of <i>t</i>-Butyldimethylsilyl Ethers to the Corresponding Acetates
Monoacylation and trifluoromethanesulfonylation of phenolic diols were achieved by the aid of HF–pyridine, whereas diacylation occurred with pyridine alone. Furthermore, HF–pyridine was found to promote the direct conversion of t-butyldimethylsilyl ethers to the corresponding acetates.
Selective Oxidation of Benzylic Alcohols and TBDMS Ethers to Carbonyl Compounds with CrO<sub>3</sub>-H<sub>5</sub>IO<sub>6</sub>
作者:Mark L. Trudell、Suhong Zhang、Liang Xu
DOI:10.1055/s-2005-869975
日期:——
Benzyl alcohols and benzyl TBDMS ethers were efficiently oxidized to the corresponding carbonylcompounds in high yield with periodic acid catalyzed by CrO 3 at low temperature (-78 °C). The oxidation procedure was highlyfunctional group tolerant and very selective for the TBDMS group over the TBDPS group.
FLP-Catalyzed Transfer Hydrogenation of Silyl Enol Ethers
作者:Imtiaz Khan、Benjamin G. Reed-Berendt、Rebecca L. Melen、Louis C. Morrill
DOI:10.1002/anie.201808800
日期:2018.9.17
Herein we report the first catalytic transfer hydrogenation of silylenolethers. This metal free approach employs tris(pentafluorophenyl)borane and 2,2,6,6‐tetramethylpiperidine (TMP) as a commercially available FLP catalyst system and naturally occurring γ‐terpinene as a dihydrogen surrogate. A variety of silylenolethers undergo efficient hydrogenation, with the reduced products isolated in excellent
Dinitrogen Tetraoxide Complexes of Iron(III) and Copper(II) Nitrates as Versatile Reagents for Organic Syntheses. Efficient Oxidative Deprotection of Silyl or Tetrahydropyranyl Ethers, Acetals, and Thioacetals
作者:Habib Firouzabadi、Nasser Iranpoor、Mohammad Ali Zolfigol
DOI:10.1246/bcsj.71.2169
日期:1998.9
efficiently in the absence of solvents at room temperature. Over-oxidation of the products has not been observed in these reactions. A synergic effect of N2O4 upon the oxidation abilities of metal nitrates is observed.