Fluorous TBAF: A Convenient and Selective Reagent for Fluoride-Mediated Deprotections
摘要:
A fluorous analogue of TBAF has been developed for its use in the clean removal of silicon-derived protecting groups. Purification of the crude mixtures by fluorous solid-phase extractions allowed alcohols, amines, and carboxylic acids to be obtained in high purity, with no need of chromatographic separations. The moderate reactivity of fluorous TBAF was exploited in selective deprotections of several bifunctional molecules.
Fluorous TBAF: A Convenient and Selective Reagent for Fluoride-Mediated Deprotections
摘要:
A fluorous analogue of TBAF has been developed for its use in the clean removal of silicon-derived protecting groups. Purification of the crude mixtures by fluorous solid-phase extractions allowed alcohols, amines, and carboxylic acids to be obtained in high purity, with no need of chromatographic separations. The moderate reactivity of fluorous TBAF was exploited in selective deprotections of several bifunctional molecules.
Mild deprotection of 2-(trimethylsilyl)ethyl esters
作者:Michael H Serrano-Wu、Alicia Regueiro-Ren、Denis R St. Laurent、Tina M Carroll、Balu N Balasubramanian
DOI:10.1016/s0040-4039(01)01859-7
日期:2001.12
A method for the deprotection of 2-(trimethylsilyl)ethyl (TMSE) esters is described. Treatment of carboxylic esters with NaH in DMF cleanly produces the deprotected acid after extractive work-up. This method can be applied to sterically-hindered substrates as well as esters containing fluoride-labile functionality. A tandem alkylation/esterdeprotection procedure is also presented.
The invention pertains to heteroaromatic compounds that serve as effective phosphodiesterase (PDE) inhibitors. In particular, the invention relates to said compounds which are selective inhibitors of PDE10. The invention also relates to intermediates for preparation of said compounds; pharmaceutical compositions comprising said compounds; and the use of said compounds in a method for treating certain central nervous system (CNS) or other disorders.
The invention pertains to heteroaromatic compounds that serve as effective phosphodiesterase (PDE) inhibitors. In particular, the invention relates to said compounds which are selective inhibitors of PDE10. The invention also relates to intermediates for preparation of said compounds; pharmaceutical compositions comprising said compounds; and the use of said compounds in a method for treating certain central nervous system (CNS) or other disorders.