作者:Dominik Gärtner、André Luiz Stein、Sabine Grupe、Johannes Arp、Axel Jacobi von Wangelin
DOI:10.1002/anie.201504524
日期:2015.9.1
unreactive in cross‐coupling reactions which mostly employ more electrophilic halides or activated esters (triflates, tosylates). Acetates are cheap and easily accessible electrophiles but have not been used in cross‐couplings because the strong CO bond and high propensity to engage in unwanted acetylation and deprotonation. Reported herein is a selective iron‐catalyzedcross‐coupling of diverse alkenyl
Nucleophile-dependent substitution reactions of 5-halovaleric acid esters: synthesis of 6,12-dioxamyristic acid
作者:Akira Katoh、Tianbao Lu、B. Devadas、Steven P. Adams、Jeffrey I. Gordon、George W. Gokel
DOI:10.1021/jo00002a046
日期:1991.1
The reaction of 5-ethoxypentan-1-ol with a variety of 5-halovalerate alkyl esters afforded ester exchange products rather than the expected products of Williamson ether synthesis. The virtually unknown reaction of an alkoxide with a 5-halovalerate ester contrasts strongly with literature reports of reactions involving other nucleophiles in which the halogen substitution products are nearly always isolated. An explanation is offered for this behavior in terms of a chelation-induced conformation of the substrate. Although the direct synthetic approach failed, the hitherto unknown title compound could still be prepared, albeit in six steps in 6% overall yield. The approach used is discussed along with the interesting chemistry of this system.
KATOH, AKIRA;LU, TIANBAO;DEVADAS, B.;ADAMS, STEVEN P.;GORDON, JEFFREY I.;+, J. ORG. CHEM., 56,(1991) N, C. 731-735
作者:KATOH, AKIRA、LU, TIANBAO、DEVADAS, B.、ADAMS, STEVEN P.、GORDON, JEFFREY I.、+
DOI:——
日期:——
US4537987A
申请人:——
公开号:US4537987A
公开(公告)日:1985-08-27
Highly Efficient Solvent-Free Condensation of Carboxylic Acids with Alcohols Catalysed by Zinc Perchlorate Hexahydrate, Zn(ClO4)2?6?H2O
Zincperchloratehexahydrate, Zn(ClO4)2⋅6H2O, efficientlycatalyses the esterification between nearly equimolar amounts of carboxylicacids and alcohols. The reaction works under solvent-free conditions at relatively low temperatures. Excellent results were obtained with a wide range of substrates.