Interrogating Pd(II) Anion Metathesis Using a Bifunctional Chemical Probe: A Transmetalation Switch
作者:John J. Molloy、Ciaran P. Seath、Matthew J. West、Calum McLaughlin、Neal J. Fazakerley、Alan R. Kennedy、David J. Nelson、Allan J. B. Watson
DOI:10.1021/jacs.7b11180
日期:2018.1.10
Ligand metathesis of Pd(II) complexes is mechanistically essential for cross-coupling. We present a study of halide→OH anion metathesis of (Ar)PdII complexes using vinylBPin as a bifunctional chemical probe with Pd(II)-dependent cross-coupling pathways. We identify the variables that profoundly impact this event and allow control to be leveraged. This then allows control of cross-coupling pathways
Condensed heteroaromatic ring systems. XVIII. Palladium-catalyzed cross-coupling reaction of aryl bromides with (Z)-1-ethoxy-2-tributylstannylethene and its utilization for construction of condensed heteroaromatics
The palladium-catalyzedcross-coupling reaction of bromobenzenes or bromoheteroarenes such as pyridine, thiophene, indole with (Z)-1-ethoxy-2-tributylstannylethene gives good yields of the corresponding (Z)-1-ethoxy-2-(aryl and heteroaryl)ethenes. This method is effective for introducing an ethoxyethenyl group into an aromatic and heteroaromatic ring and is proved to have versatile utility for the
钯催化的溴苯或溴杂芳烃(如吡啶,噻吩,吲哚)与(Z)-1-乙氧基-2-三丁基锡烷基苯的钯催化交叉偶联反应可得到相应的(Z)-1-乙氧基-2-(芳基和杂芳基)乙烯。该方法可有效地将乙氧基乙烯基引入芳族和杂芳族环中,并被证明具有广泛的用途,可用于由2-溴苯酚,2-溴苯胺和2-溴苯甲酸酯衍生物构建苯并[ b ]呋喃,吲哚,异香豆素环。 。
Synthesis of Chiral Acetals by Asymmetric Selenenylations
作者:Lars Uehlin、Thomas Wirth
DOI:10.1080/10426500902930167
日期:2009.6.23
Asymmetric selenenylations of (E)-ethoxystyrene are described leading to chiralacetals. An efficient synthesis of such compounds including the determination of their absolute configuration is described.
Asymmetric methoxyselenenylation of alkyl vinyl ethers: a new route to chiral acetals
作者:Masahiko Uchiyama、Shinya Satoh、Akihiro Ohta
DOI:10.1016/s0040-4039(00)02285-1
日期:2001.2
The asymmetricmethoxyselenenylation of alkyl vinyl ethers afforded the corresponding chiral acetals with moderate to good diastereoselectivity. This reaction and subsequent deselenenylation provided a new method of preparing enantiomerically enriched acetals in which the acetal carbon was the only stereogenic center.
and the use of a radical generator facilitated the oxygenation of these olefins. These oxidations afforded the corresponding epoxides or their derivatives in considerable yields as well as carbonyl compounds resulting from oxidative cleavage of the double bonds. The mechanisms for these oxidations are proposed to involve free-radical chain pathways and charge-transfer complexes between the olefins and