(3-苯氧基丙-1-yn-1-基)苯方便的室温无金属一锅级联亲电加成/环化/氧化反应发散选择性合成溴化苯并吡喃(3-bromo-2 H -chromenes, 3 -bromo-2 H -chromen-2-ols 和 3-bromo-2 H -chromen-2-ones),通过调整 Br 2和 H 2 O 的试剂量。
Borderline metal catalysts, Bi(OTf)3 and Fe(OTf)3, were proven to work as dual activators for alkynes and N,O-acetals via σ,π-chelation, which achieved a new carboarylation reaction of alkynylarenes with N,O-acetals.
Assembly of 3-(trifluoromethyl)thiochromenes via a regioselective trifluoromethylthioarylation of (3-arylprop-2-ynyl)oxybenzenes with trifluoromethanesulfanylamide
作者:Tong Liu、Guanyinsheng Qiu、Qiuping Ding、Jie Wu
DOI:10.1016/j.tet.2016.01.053
日期:2016.3
trifluoromethanesulfanylamide is reported, which affords 3-(trifluoromethyl)thiochromenes in good yields with high regioselectivity. The reaction works efficiently in the presence of 2.0 equiv of bismuth chloride, and different functional groups can be compatible under the conditions. The related (3,4-dihydronaphthalen-2-yl) (trifluoromethyl)sulfane and 3-((trifluoromethyl)thio)-1,2-dihydroquinoline can be generated
Facile synthesis of HFIP esters-containing 2H-benzopyrans through palladium-catalyzed one-pot cyclization/carbonylation using formic acid as the CO source
作者:Dan Wen、Boyu Yao、Xinxin Qi、Xiao-Feng Wu
DOI:10.1016/j.jcat.2024.115602
日期:2024.8
straightforward procedure for the synthesis of HFIP esters-containing 2H-benzopyrans has been established through palladium-catalyzed one-pot cyclization/carbonylation reaction of substituted propargyl ethers with HFIP by using formic acid as the CO precursor. A diverse set of 2H-benzopyrans have been formed with HFIP esters as attractive functional groups in moderate to excellent yields. This protocol features
通过使用甲酸作为 CO 前体,取代的炔丙基醚与 HFIP 进行钯催化一锅环化/羰基化反应,建立了一种有效且简单的合成含 2H-苯并吡喃 HFIP 酯的方法。以 HFIP 酯作为有吸引力的官能团,以中等至优异的产率形成了多种 2H-苯并吡喃。该协议具有广泛的底物范围和不操作有毒 CO 气体的特点。
Synthesis of thioester-functionalized 2H-benzopyrans through palladium-catalyzed one-pot cyclization/thiocarbonylation using sulfonyl chlorides as the sulfur sources
efficient protocol for the synthesis of thioesters-functionalized 2-benzopyrans has been developed through a palladium-catalyzed one-pot cyclization/thiocarbonylation reaction of propargyl ethers with sulfonylchlorides as promising and easily accessible sulfur sources. The reaction showed good compatibility towards versatile functional groups, both aryl and alkylsulfonyl chlorides were well tolerated. Without
Synthesis of amides-substituted 2H-benzopyrans through palladium-catalyzed one-pot aminocarbonylation reaction with nitro compounds as the nitrogen sources
An efficient and straightforward procedure toward the synthesis of amides-substituted 2-benzopyrans has been explored throughpalladium-catalyzed one-pot aminocarbonylation reaction. By using nitro compounds as attractive nitrogen sources, with Mo(CO) as both CO source and reductant, a variety of amides-containing 2-benzopyrans were obtained in moderate to high yields with good functional group tolerance