<scp>Palladium‐Catalyzed</scp>
Decarboxylative Homodimerization of Propiolic Acids: Synthesis of 1,
<scp>3‐Enynes</scp>
作者:Eunkyeong Seo、Jonghoon Oh、Sunwoo Lee
DOI:10.1002/bkcs.12221
日期:2021.3
was obtained as a result of a decarboxylative homodimerization reaction when a variety aryl propiolicacids were reacted in the presence of Pd(TFA)2/i‐PrPPh2 and K2CO3. It was found that aryl propiolicacids bearing an electrondonating substituent provided the desired product; however, aryl propiolicacids an bearing electron‐withdrawing substituent did not give the desired product.
当各种芳基丙酸在Pd(TFA)2 / i-PrPPh2和K 2 CO 3存在下反应时,通过脱羧均二聚反应获得1,3-烯炔产物。发现带有电子给体取代基的芳基丙酸提供了所需的产物。但是,带有轴承吸电子取代基的芳基丙酸不能提供所需的产物。
The synthesis of vinyl sulfone derivatives via the reaction of arylpropiolic acids, K2S2O5, and aryl boronic acids is reported. The CuBr2/1,10-phenanthroline catalytic system in the presence of acetic acid provides the desired vinyl sulfones in moderate to good yield. Furthermore, the methodology features excellent functional group tolerance.
报道了通过芳基丙炔酸、K 2 S 2 O 5和芳基硼酸的反应合成乙烯基砜衍生物。在乙酸存在下的 CuBr 2 /1,10-菲咯啉催化体系以中等至良好的产率提供所需的乙烯基砜。此外,该方法具有出色的官能团耐受性。
Visible-Light Photocatalytic Decarboxylation of α,β-Unsaturated Carboxylic Acids: Facile Access to Stereoselective Difluoromethylated Styrenes in Batch and Flow
development of synthetic methodologies which provide access to both stereoisomers of α,β-disubstituted olefins is a challenging undertaking. Herein, we describe the development of an operationallysimple and stereoselectivesynthesis of difluoromethylated styrenes via a visible-light photocatalytic decarboxylation strategy using fac-Ir(ppy)3 as the photocatalyst. Meta- and para-substituted cinnamic acids provide
Ruthenium-Catalyzed C–H Activation of Salicylaldehyde and Decarboxylative Coupling of Alkynoic Acids for the Selective Synthesis of Homoisoflavonoids and Flavones
作者:Gabriel Charles Edwin Raja、Ji Yeon Ryu、Junseong Lee、Sunwoo Lee
DOI:10.1021/acs.orglett.7b03325
日期:2017.12.15
Homoisoflavonoids were formed in DMSO exclusively, and flavones were formed in t-AmOH when salicylaldehyde and alkynoicacids reacted with [Ru(p-cymene)Cl2]2 and CsOAc. They were formed through C–H activation of salicylaldehyde and decarboxylative coupling of alkynoicacid. This reaction system showed good yields, broad substrate scope, and good functional group tolerance. It was found that chalcone
Herein, a cascade [3 + 2] annulation of N-aryloxyacetamides with 3-(hetero)arylpropiolic acids affording benzofuran-2(3H)-ones via rhodium(iii)-catalyzed redox-neutral C-H functionalization/isomerization/lactonization using an internal oxidative directing group O-NHAc was achieved. This catalytic system provides a regio- and stereoselective approach to synthesize (Z)-3-(amino(aryl)methylene)benzofuran-2(3H)-ones