Efficient chemoselective deprotection of silyl ethers using catalytic 1-chloroethyl chloroformate in methanol
摘要:
Fast and chemoselective desilylation of silyl-protected alcohols was achieved using a catalytic amount of 1-chloroethyl chloroformate in methanol. With a minimal amount of 1-chloroethyl chloroformate as the source for anhydrous HCl, extremely efficient cleavage of silyl ethers of primary and secondary alcohols was accomplished, and chemoselective deprotection of one silyl ether in the presence of another silyl or other acid-labile group was possible through controlling the amount of the chloroformate and reaction time. (c) 2005 Elsevier Ltd. All rights reserved.
The chemoselective and efficient deprotection of silyl ethers using trimethylsilyl bromide
作者:Syed Tasadaque A. Shah、Patrick J. Guiry
DOI:10.1039/b803949f
日期:——
An efficient and chemoselective cleavage of silyl ethers (primary, secondary and aromatic) by using catalytic quantities of trimethylsilylbromide (TMSBr) in methanol is reported. A wide range of alkyl silyl ethers such as TBS, TIPS, and TBDPS can be chemoselectively cleaved in high yield in the presence of aryl silyl ethers. The deprotection of silyl esters was also achieved employing catalytic quantities
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
Selective deprotection of alkyl vs. aryl silyl ethers
作者:Bruce H Lipshutz、John Keith
DOI:10.1016/s0040-4039(98)00381-5
日期:1998.4
Alkyl silyl ethers, in particular t-butyldimethylsilyl derivatives, can be selectively cleaved in high yields over aryl silyl ethers using small percentages of I2 in MeOH at ambient temperatures.
DBU-Mediated Mild and Chemoselective Deprotection of Aryl Silyl Ethers and Tandem Biaryl Ether Formation
作者:B. Kim、Chang-Eun Yeom、Hye Kim、So Lee
DOI:10.1055/s-2006-958425
日期:2007.1
selective cleavage of arylsilylethers is established using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). With either 1.0 or 0.10 equivalent of DBU, smooth desilylation of various arylsilylethers was accomplished selectively in the presence of alkyl silylethers and other base-sensitive groups such as acetate and ester. In addition, direct transformation of arylsilylethers into biaryl ethers using a catalytic
使用 1,8-二氮杂双环 [5.4.0] undec-7-ene (DBU) 建立了一种选择性裂解芳基甲硅烷基醚的有效方法。使用 1.0 或 0.10 当量的 DBU,在烷基甲硅烷基醚和其他碱敏感基团(如乙酸酯和酯)的存在下,可以选择性地完成各种芳基甲硅烷基醚的顺利脱甲硅烷基化。此外,通过串联脱甲硅烷基化和 SN Ar 与活化的芳基氟化物反应,可以使用催化量的 DBU 将芳基甲硅烷基醚直接转化为联芳基醚。