Ruthenium(III) chloride catalyzed acylation of alcohols, phenols, thiols, and amines
作者:Surya Kanta De
DOI:10.1016/j.tetlet.2004.02.071
日期:2004.3
Ruthenium(III) chloride catalyzes the acylation of a variety of phenols, alcohols, thiols, and amines under mild conditions. Some of the major advantages of this method are high yields, short reaction times, ease of operation, and compatibility with other protecting groups.
A Highly Efficient and UsefulSynthetic Protocol for the Cleavage of<i>tert</i>-Butyldimethylsilyl(TBS) Ethers Using a Catalytic Amount of Acetyl Chloridein Dry Methanol
作者:Abu T. Khan、Ejabul Mondal
DOI:10.1055/s-2003-38360
日期:——
A wide variety of tert-butyldimethylsilyl (TBS) ethers as well as tert-butyldiphenylsilyl (TBDPS) ethers 1 can be easily deprotected to the corresponding parent hydroxyl compounds 2 by employing catalytic amounts of acetyl chloride in dry MeOH at 0 °C to room temperature in good yields. Some of the major advantages are mild conditions, high efficiency, high selectivity, high yields, easy operation, and also compatibility with other protecting groups. Furthermore, no acetylation nor chlorination takes place under the experimental conditions.
A mild and selective cleavage of tert-butyldimethylsilyl ethers by indium(III) chloride
作者:Jhillu S. Yadav、Basi V. Subba Reddy、Chinnala Madan
DOI:10.1039/b004937i
日期:——
Alkyl tert-butyldimethylsilyl ethers are selectively deprotected to the corresponding alcohols in high yields for the first time by indium(III) chloride in refluxing aqueous acetonitrile. Several functional groups like OBn, Boc, CBz, OBz, O-allyl, OTBDPS, OAc, OMe, ethers, esters and olefins present in the substrate are unaffected.
Tetrabutylammonium Tribromide (TBATB)−MeOH: An Efficient Chemoselective Reagent for the Cleavage of <i>tert</i>-Butyldimethylsilyl (TBDMS) Ethers
作者:Rangam Gopinath、Bhisma K. Patel
DOI:10.1021/ol006720s
日期:2000.12.1
[GRAPHICS]TBDMS, THP, and DMT ethers are efficiently deprotected with tetrabutylammonium tribromide in methanol, The apparent order of stability of different protecting group is phenolic TBDMS > 1 degrees OTBDPS > 2 degrees OTBDMS > 2 degrees OTHP > 1 degrees OTHP > 1 degrees OTBDMS > 1 degrees ODMT. TBDMS ether has been cleaved selectively in the presence of isopropylidine, an, Ac, Bz, THP, and TBDPS groups. This method is high yielding, fast, clean, safe, cost effective, and therefore most suitable for practical organic synthesis.
A New Method for the Preparation of 1-Ethynyl Ethers