Palladium-Catalyzed Dehydrogenative β′-Arylation of β-Keto Esters under Aerobic Conditions: Interplay of Metal and Brønsted Acids
作者:Kai-Tai Yip、Roshan Y. Nimje、Mikko V. Leskinen、Petri M. Pihko
DOI:10.1002/chem.201201988
日期:2012.10.1
The Brønsted aids: The first dehydrogenative arylation of β‐keto esters with arenes under ambient aerobic conditions is described (see scheme). Under a PdII/Brønstedacid co‐catalytic system, regioselective arylations with alkoxylated arenes and phenols were achieved in good yields, even in gram‐scale conditions.
布朗斯台德助剂:描述了在环境好氧条件下,β-酮酯与芳烃的第一次脱氢芳基化反应(参见方案)。在Pd II /布朗斯台德酸共催化体系下,即使在克级条件下,也能以良好的收率实现烷氧基化的芳烃和苯酚的区域选择性芳基化。
Shifted Selectivity in Protonation Enables the Mild Deuteration of Arenes Through Catalytic Amounts of Bronsted Acids in Deuterated Methanol
作者:Oliver Fischer、Anja Hubert、Markus R. Heinrich
DOI:10.1021/acs.joc.0c01604
日期:2020.9.18
effect” of the solvent methanol, deuterations of electron-rich aromatic systems can be carried out under mild acid catalysis and thus under far milder conditions than known so far. The exceptional functional group tolerance observed under the optimized conditions, which even includes highly acid-labile groups, results from a hitherto unexploited shifted selectivity in protonation, and enabled simple
Direct Oxidative Heck Cyclizations: Intramolecular Fujiwara-Moritani Arylations for the Synthesis of Functionalized Benzofurans and Dihydrobenzofurans
作者:Haiming Zhang、Eric M. Ferreira、Brian M. Stoltz
DOI:10.1002/anie.200461294
日期:2004.11.19
Formylations of anions with a ‘Weinreb’ formamide: N-methoxy-N-methylformamide
作者:Bruce H. Lipshutz、Steven S. Pfeiffer、Will Chrisman
DOI:10.1016/s0040-4039(99)01645-7
日期:1999.11
Treatment of organolithiums, Grignard reagents, or enolates with N-methoxy-N-methylformamide leads to formylated products in good yields without competing secondary processes. (C) 1999 Elsevier Science Ltd. All rights reserved.
Luszniak, Mark C.; Topiwala, Upendra P.; Whiting, Donald A., Journal of Chemical Research, Miniprint, 1998, # 7, p. 1401 - 1417
作者:Luszniak, Mark C.、Topiwala, Upendra P.、Whiting, Donald A.