Novel synthetic routes suitable for constructing benzopyrone combinatorial libraries
摘要:
A series of O-(t-butylsilyloxy)benzoyl chlorides generated from the corresponding silyl esters were coupled with a range of terminal alkynes to afford the corresponding alkynyl ketones. The alkynyl ketones were converted to enaminoketones and then cyclized to yield the desired benzopyrone ring system. This synthetic protocol utilizes readily available starting materials, mild and high yielding reactions with good functional group tolerance, and is ideal for developing combinatorial libraries centered around the benzopyrone ring system. (C) 1999 Elsevier Science Ltd. All rights reserved.
A mild palladium(II) catalyzed desilylation of phenolic t-butyldimethylsilyl ethers
作者:Noel S Wilson、Brian A Keay
DOI:10.1016/0040-4039(95)02120-5
日期:1996.1
A variety of phenolict-butyldimethylsilylethers are easily removed in good to excellent yields by treatment with 5 mol % PdCl2(CH3CN)2 in refluxing acetone containing 5 equivalents of water.
A Novel, Chemoselective and Efficient Microwave-Assisted Deprotection of Silyl Ethers with Selectfluor
作者:Syed Tasadaque A. Shah、Surendra Singh、Patrick J. Guiry
DOI:10.1021/jo802494t
日期:2009.3.6
efficient method for the cleavage of silyl ethers (aliphatic and aromatic) catalyzed by Selectfluor is reported. A wide range of TBS-, TIPS-, and TBDPS-protected alkyl silyl ethers can be chemoselectively cleaved in high yield in the presence of aryl silyl ethers. The chemoselective deprotection of phenolic TBS ethers, and not the TIPS- or TBDPS-protected phenolic ethers, and the deprotection of silyl esters
Mild base mediated desilylation of various phenolic silyl ethers
作者:Noel S. Wilson、Brian A. Keay
DOI:10.1016/s0040-4039(96)02270-8
日期:1997.1
A variety of phenolic silyl ethers are easily desilylated in good to excellent yields by treatment with 1.1 equivalents of K2CO3, and ethanol containing 5 equivalents of water.
通过用1.1当量的K 2 CO 3和含5当量的水的乙醇处理,各种酚类甲硅烷基醚很容易被甲硅烷基化,产率高至优异。