a highly modular, clean, and scalable access to a broad variety of alkynyl sulfides in good‐to‐excellent yields. The utility of this protocol was showcased by the preparation of alkynyl sulfides, which are particularly difficult to obtain or simply unavailable through the existing methodologies. In addition, the synthetic method was extended to the preparation of alkynyl selenides.
Palladium-Catalyzed Cross-Coupling of Electron-Poor Terminal Alkynes with Arylboronic Acids under Ligand-Free and Aerobic Conditions
作者:Ming-Bo Zhou、Wen-Ting Wei、Ye-Xiang Xie、Yong Lei、Jin-Heng Li
DOI:10.1021/jo101063p
日期:2010.8.20
Palladium-catalyzed cross-coupling reaction of terminal alkynes with arylboronicacids has been described. In the presence of Pd(OAc)2 and Ag2O, a variety of terminal alkynes, including electron-poor terminal alkynes, smoothly underwent the reaction with numerous boronic acids to afford the corresponding internal alkynes in moderate to good yields. Moreover, this methodology was applied to the synthesis
Silver-Catalyzed Intermolecular [3 + 2]/[5 + 2] Annulation of <i>N</i>-Arylpropiolamides with Vinyl Acids: Facile Synthesis of Fused 2<i>H</i>-Benzo[<i>b</i>]azepin-2-ones
作者:Yang Li、Ming Hu、Jin-Heng Li
DOI:10.1021/acscatal.7b02061
日期:2017.10.6
silver-catalyzed oxidative intermolecular [3 + 2]/[5 + 2] annulation of N-arylpropiolamides with 4-vinyl acids for producing fused 2H-benzo[b]azepin-2-ones is described. This radical-mediated annulation reaction features broad substrate scope and excellent selectivity, and enables the formation of three new C–C bonds through oxidative decarboxylation, [3 + 2]/[5 + 2] annulations, and C(sp2)-H functionalization
Decarbonylative Formation of Homoallyl Radical Capable of Annulation with <i>N</i>-Arylpropiolamides via Aldehyde Auto-oxidation
作者:Yang Li、Jin-Heng Li
DOI:10.1021/acs.orglett.8b02243
日期:2018.9.7
A new metal-free aldehyde auto-oxidation strategy that allows the decarbonylative formation of homoallyl radical capable of cascade annulations with alkynes is described. By using various N-arylpropiolamides, the oxidative radical [3 + 2]/[5 + 2] cascade annulation reaction was achieved to produce benzo[b]cyclopenta[e]azepin-4(1H)-ones, which represent a powerful new platform for the intermolecular
描述了一种新的无金属的醛自氧化策略,该策略允许脱羰基形成能够与炔烃级联成环的均烯丙基自由基。通过使用各种N-芳基丙酰胺,氧化自由基[3 + 2] / [5 + 2]级联环化反应生成苯并[ b ]环戊[ e ] azepin-4(1 H)-one,代表了用于炔烃分子间环加成的新平台,具有广泛的底物范围和高选择性。
PhI(OCOCF<sub>3</sub>)<sub>2</sub>-Mediated Construction of a 2-Spiropseudoindoxyl Skeleton via Cascade Annulation of 2-Sulfonamido-<i>N</i>-phenylpropiolamide Derivatives
作者:Bobo Zhang、Xiang Zhang、Bei Hu、Desong Sun、Senlin Wang、Daisy Zhang-Negrerie、Yunfei Du
DOI:10.1021/acs.orglett.7b00058
日期:2017.2.17
A cascade annulation of 2-sulfonamido-N-phenylpropiolamide derivatives leading to the construction of the 2-spiropseudoindoxyl skeleton was realized under mild conditions with phenyliodine(III) bis(trifluoroacetate) (PIFA) as the sole oxidant. This metal-free spirocyclization process is suggested to encompass a sequential C(sp(2))-C(sp) and C(sp(2))-N bond formation with the concomitant introduction of a carbonyl oxygen.