Ligand-, Copper-, and Amine-Free Sonogashira Reaction of Aryl Iodides and Bromides with Terminal Alkynes
作者:Sameer Urgaonkar、John G. Verkade
DOI:10.1021/jo049325e
日期:2004.8.1
and amine-free palladium-catalyzed Sonogashirareaction of aryl iodides and bromides with terminal alkynes have been developed. Critical to the success of this new protocol is the use of tetrabutylammonium acetate as the base. Noteworthy features of this method are room-temperature conditions and the tolerance of a broad range of functional groups in both reaction partners.
A compound of formula (I): ##STR1## or a salt, ester or amide thereof, in which Y is a group --O(CH.sub.2).sub.m --, --(CH.sub.2).sub.m -- or --CH.dbd.CH-- where m is an integer of from 1 to 5 n is an integer of from 4 to 14 X represents a double or triple bond, and each of A and B represents hydrogen when X is a double bond, or both A and B are absent when X is a triple bond, is useful in the treatment of allergic diseases.
A versatile two-stage synthesis of 2-substituted benzo[b]furans from (2-methoxyphenyl)ethynes
作者:Derek R. Buckle、Caroline J. M. Rockell
DOI:10.1039/p19850002443
日期:——
(2-Methoxyphenyl)ethynes react with aryl or alkyl halides to give disubstituted alkynes which are converted into the corresponding 2-substitutedbenzo[b]furans on treatment with lithium iodide in 2,4,6-trimethylpyridine.
(2-甲氧基苯基)乙炔与芳基或烷基卤化物反应,得到二取代的炔,在碘化锂在2,4,6-三甲基吡啶中处理后,将其转化为相应的2-取代的苯并[ b ]呋喃。
Synthesis of 2,3-Disubstituted Benzo[<i>b</i>]furans by the Palladium-Catalyzed Coupling of <i>o-</i>Iodoanisoles and Terminal Alkynes, Followed by Electrophilic Cyclization
作者:Dawei Yue、Tuanli Yao、Richard C. Larock
DOI:10.1021/jo051299c
日期:2005.12.1
2,3-Disubstitutedbenzo[b]furans are readily prepared under very mild reaction conditions by the palladium/copper-catalyzed cross-coupling of various o-iodoanisoles and terminalalkynes, followed by electrophilic cyclization with I2, PhSeCl, or p-O2NC6H4SCl. Aryl- and vinylic-substituted alkynes undergo electrophilic cyclization in excellent yields. Biologically important furopyridines can be prepared
2,3-二取代的苯并[ b ]呋喃很容易在很温和的反应条件下通过钯/铜催化的各种邻碘苯甲醚和末端炔的交叉偶联反应,然后用I 2,PhSeCl或p-进行亲电环化而制得。 O 2 NC 6 H 4 SCl。芳基和乙烯基取代的炔烃以优异的收率进行亲电子环化。生物学上重要的呋喃吡啶可以通过这种方法以高产率制备。