2,3-取代的 4-氯-2-环丁烯酮,由取代的环丁烯二酮的区域特异性转化制备,经过钯催化与乙烯基和芳基锡烷以及乙烯基锆试剂交叉偶联,形成 4-R unsat -2-环丁烯酮。在热解 (100 o C) 时,这些底物以高产率转化为取代的苯酚。使用这种化学方法以区域特异性方式制备了五取代的芳香族化合物和各种三取代和四取代的芳香族化合物
Collective Synthesis of Chiral Tetrasubstituted Cyclobutanes Enabled by Enantioconvergent Negishi Cross‐Coupling of Cyclobutenones
作者:Min Yan、Qiang Zhou、Ping Lu
DOI:10.1002/anie.202218008
日期:2023.2.6
Allylic substitution of readily available dichlorocyclobutenones and subsequent enantioconvergent Negishi coupling afforded 2,3,4-trisubstituted cyclobutenones. Further structural elaborations provided a group of 1,2,3,4-tetrasubstituted cyclobutanes with different stereochemical classes.
A synthesis of substituted 2-pyrones by carbonylative cross-coupling-thermolysis of 4-halocyclobutenones with alkenyl-, aryl-, and heteroarylstannanes
作者:Lanny S Liebeskind、Jianying Wang
DOI:10.1016/s0040-4020(01)87262-8
日期:1993.1
Palladium catalyzed carbonylative cross-coupling of 4-chloro-2,3-disubstituted-2-cyclobutenones with alkenyl-, aryl-, and heteroaryltin reagents and thermolysis provides a general method for the synthesis of 2,3,6-trisubstituted-2-pyrones. The reaction is regiospecific, coupling occurring preferentially at the 4-position of the cyclobutenone.
Benzannulation of aromatic heterocycles. A regiocontrolled method for construction of substituted benzo- and dibenzofurans and benzo- and dibenzothiophenes
作者:Lanny S. Liebeskind、Jianying Wang
DOI:10.1021/jo00065a017
日期:1993.6
4-Chloro-2,3-disubstituted-2-cyclobutenones undergo palladium-catalyzed cross-coupling with oxygen and sulfur heteroaryl tin reagents, and upon thermolysis at 100-degrees-C, good to high yields of substituted benzannulated heteroaromatics are formed. Relying on the control inherent in the construction of 4-chloro-2,3-disubstituted-2-cyclobutenones, regioisomeric substituted heteroaromatics are easily prepared.