Pd-Catalyzed Copper-Free Carbonylative Sonogashira Reaction of Aryl Iodides with Alkynes for the Synthesis of Alkynyl Ketones and Flavones by Using Water as a Solvent
作者:Bo Liang、Mengwei Huang、Zejin You、Zhengchang Xiong、Kui Lu、Reza Fathi、Jiahua Chen、Zhen Yang
DOI:10.1021/jo050498t
日期:2005.7.1
Pd-catalyzed copper-free carbonylative Sonogashira coupling reaction to synthesize alkynyl ketones from terminal alkynes and aryl iodides was achieved by using water as a solvent. The reaction was carried out at room temperature under balloon pressure of CO with Et3N as a base. The developed method was successfully applied to the synthesis of flavones.
Recyclable and reusable PdCl2(PPh3)2/PEG-2000/H2O system for the carbonylative Sonogashira coupling reaction of aryl iodides with alkynes
作者:Hong Zhao、Mingzhu Cheng、Jiatao Zhang、Mingzhong Cai
DOI:10.1039/c3gc42278j
日期:——
PdCl2(PPh3)2 in a mixture of water and poly(ethylene glycol) (PEG-2000) is shown to be an extremely active catalyst for the carbonylative Sonogashira coupling reaction of aryl iodides with terminal alkynes. The reaction can be conducted under an atmospheric pressure of carbon monoxide at 25 °C with Et3N as a base, yielding a variety of alkynyl ketones in good to excellent yields. Application of this synthetic method to prepare flavones from o-iodophenol and terminal alkynes was also achieved. The isolation of the products is readily achieved by extraction with diethyl ether, and the PdCl2(PPh3)2/PEG-2000/H2O system can be easily recycled and reused six times without any loss of catalytic activity.
An efficient method for the synthesis of flavones and γ-benzopyranones has been developed utilizing a mildSonogashiracoupling and 18-crown-6ethermediated 6-endo cyclization of o-alkynoylphenyl acetates. By using this strategy, flavones and γ-benzopyranones bearing electron-donating groups, halogens, and simple alkyl substituents were synthesized in satisfactory yields.
Rh(III)-catalyzed C–H activation of salicylaldehyde followed by an insertion reaction with sulfoxonium ylides and cyclization is applied to the synthesis of flavonoids. This one-pot strategy exhibits good functional group tolerance and gives flavones in moderate-to-good yields.
ACETAMIDO-PHENYLTETRAZOLE DERIVATIVES AND METHODS OF USING THE SAME
申请人:Athenex, Inc.
公开号:US20220106312A1
公开(公告)日:2022-04-07
The present disclosure relates to compounds of Formula (IA)
and to their prodrugs, pharmaceutically acceptable salts, pharmaceutical compositions, methods of use, and methods for their preparation. The compounds disclosed herein are useful for the treatment of disorders in which P-glycoprotein and/or cytochrome P450 (e.g. CYP3A4) is modulated (e.g., cancers which have developed multi-drug resistance).