Iron catalyzed cross coupling reactions of aromatic compounds
申请人:——
公开号:US20030220498A1
公开(公告)日:2003-11-27
A process for the production of compounds Ar—R
1
by means of a cross-coupling reaction of an organometallic reagent R
1
—M with an aromatic or heteroaromatic substrate Ar—X catalyzed by one or several iron salts or iron complexes as catalysts or pre-catalysts, present homogeneously or heterogeneously in the reaction mixture. This new invention exhibits substantial advantages over established cross coupling methodology using palladium- or nickel complexes as the catalysts. Most notable aspects are the fact that (i) expensive and/or toxic nobel metal catalysts are replaced by cheap, stable, commercially available and toxicologically benign iron salts or iron complexes as the catalysts or pre-catalysts, (ii) commercially attractive aryl chlorides as well as various aryl sulfonates can be used as starting materials, (iii) the reaction can be performed under “ligand-free” conditons, and (iv) the reaction times are usually very short.
Heteroaromatic Synthesis <i>via</i> Olefin Cross-Metathesis: Entry to Polysubstituted Pyridines
作者:Timothy J. Donohoe、José A. Basutto、John F. Bower、Akshat Rathi
DOI:10.1021/ol103088r
日期:2011.3.4
The olefin cross-metathesis reaction provides a rapid and efficient method for the synthesis of α,β-unsaturated 1,5-dicarbonyl derivatives which then serve as effective precursors to mono−tetrasubstituted pyridines. Manipulation of the key 1,5-dicarbonyl intermediate allows access to pyridines with a wide range of substitution patterns. An extension of this methodology facilitates the preparation of
A highly efficient total synthesis of (R)-(+)-muscopyridine by intramolecular [4+2] cycloaddition of bisketene
作者:Kie Suwa、Yasuko Morie、Yumiko Suzuki、Kiyoshi Ikeda、Masayuki Sato
DOI:10.1016/j.tetlet.2007.12.112
日期:2008.2
A highly efficienttotalsynthesis of (R)-(+)-muscopyridine 1 has been accomplished in 12 steps with 40% overall yield. A highlight of the synthesis is the intramolecular [4+2] cycloaddition of bisketene to afford a bridged pyrone and ring transformation of the pyrone to afford pyridine derivatives.
AMINO ACID SEQUENCES FROM ACTIVE PRINCIPLE OF MUSK AND THEIR ACETIC SALT, ALSO THE PREPARATION AND USAGE
申请人:Wu, Wenyan
公开号:EP1714976A1
公开(公告)日:2006-10-25
In the present invention, there are disclosed some acid sequences obtained from the active principle in Chinese traditional medicine musk, such as SDSECPLLCEVWILK, SDSECPLLPRQGTGSLH, IDCECPLLEAKCPSFPLWPQGREEERQ, SDSECPLLLNGTNTSSRFESINCVFLSTEEGC and their acetic salt. The method of preparing the above said sequences and their application for anti-inflammatory medicine or immunity inhibitor are also disclosed by this invention.
Reactions of olefin derivatives in the presence of methathesis catalysts
申请人:Umicore AG & Co. KG
公开号:US11161104B2
公开(公告)日:2021-11-02
The invention provides a method for synthesizing musk macrocycles comprising contacting an easily accessible diene starting materials bearing a Z-olefin moiety and performing a ring closing metathesis reaction in the presence of a Group 8 olefin metathesis catalyst.