Pd/C-mediated depropargylation of propargyl ethers/amines in water
摘要:
Propargyl ethers and amines are effectively depropargylated to the parent alcohols or amines via a C-O/C-N bond cleavage catalyzed by 10% Pd/C in water. This simple, facile, and inexpensive methodology could be utilized for the selective removal of propargyl groups from a variety of aryl ethers and amines. (C) 2012 Elsevier Ltd. All rights reserved.
two‐step: Chroman‐3‐ones are important intermediates for organic synthesis and medicinal chemistry. However, their syntheses require multiple steps and are not efficient. By using gold‐catalyzed alkyne oxidation, this versatile heterocycle can be prepared in only two steps from readily available phenols and with mostly high efficiencies (see scheme).
A series of new 1,2,3-triazolo-phenanthrene hybrids has been synthesized by employing Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. These compounds were evaluated for their in vitro cytotoxic potential against various human cancer cell lines viz. lung (A549), prostate (PC-3 and DU145), gastric (HGC-27), cervical (HeLa), triple negative breast (MDA-MB-231, MDA-MB-453) and breast (BT-549
A Hierarchy of Aryloxide Deprotection by Boron Tribromide
作者:Sreenivas Punna、Stéphane Meunier、M. G. Finn
DOI:10.1021/ol0489898
日期:2004.8.1
Aryl propargyl ethers and esters are cleaved selectively in the presence of aryl methyl ethers and esters by borontribromide in dichloromethane. Under the same conditions, allyl ethers undergo very rapid Claisen rearrangement, and benzyl ethers are also cleaved more rapidly than propargyl. A mechanism involving intramolecular delivery of bromide to the propargyl terminus is proposed. [reaction: see
An electrochemical method for selectively sensing and accurately quantifying monoamine oxidase A in live mouse brains was reported.
报道了一种电化学方法,可以选择性地感测并准确测量活体小鼠脑中的单胺氧化酶A。
Synthesis, biophysical characterization, and anti-HIV-1 fusion activity of DNA helix-based inhibitors with a p-benzyloxyphenyl substituent at the 5′-nucleobase site
mechanisms of action. In this work, two novel nucleoside analogues (1 and 2) were synthesized and incorporated into four DNA duplex- and quadruplex-based inhibitors. All the molecules showed anti-HIV-1 fusion activity. The effect of the p-benzyloxyphenyl group and the attached linker on the helix formation and thermal stability were fully compared and discussed. Surface plasmon resonance analysis further