(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。
Palladium-Catalyzed Tandem Oxidative Arylation/Olefination of Aromatic Tethered Alkenes/Alkynes
作者:Yang Gao、Yinglan Gao、Wanqing Wu、Huanfeng Jiang、Xiaobo Yang、Wenbo Liu、Chao-Jun Li
DOI:10.1002/chem.201605351
日期:2017.1.18
We describe herein a palladium‐catalyzed tandem oxidative arylation/olefination reaction of aromatic tethered alkenes/alkynes for the synthesis of dihydrobenzofurans and 2 H‐chromene derivatives. This reaction features a 1,2‐difunctionalization of C−C π‐bond with two C−H bonds using O2 as terminal oxidant at room temperature. The products obtained are valuable synthons and important scaffolds in biological
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
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