PhI(OCOCF3)2-Mediated Construction of a 2-Spiropseudoindoxyl Skeleton via Cascade Annulation of 2-Sulfonamido-N-phenylpropiolamide Derivatives
摘要:
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.
the most useful reactants for the synthesis of alkyne and alkene derivatives. Because an alkyne undergoes addition reaction at a C–C triple bond or cross-coupling at a terminal C–H bond. Combining those reaction patterns could realize a new reaction methodology to synthesize complex molecules including C–C multiple bonds. In this report, we found that the reaction of 3 equivalents of terminal alkyne
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。
Oxidative Radical Cyclization of <i>N</i>
-methyl-<i>N</i>
-arylpropiolamide to Isatins via Cleavage of the Carbon-carbon Triple Bond
A radical cyclization of N‐methyl‐N‐arylpropiolamide to isatins via an oxidative cleavage of a carbon‐carbon triple bond has been developed. In the presence of oxone and NaNO2, a variety of N‐methyl‐N‐arylpropiolamides were smoothly transformed into isatins. A nitration reaction proceeded along with the oxidative cyclization; both nitrated and non‐nitrated isatins were obtained in a one‐pot reaction
Palladium-Catalyzed Alcoholysis of 3-Iodopropynamides: Selective Synthesis of Carbamoylacetates
作者:Can-Cheng Guo、Jian-Sheng Tang
DOI:10.1055/s-0034-1379104
日期:——
A novel and selective method for the synthesis of carbamoylacetates via the alcoholysis of 3-iodopropynamides has been developed. 3-Iodopropynamides react with alcohols in the presence of palladium(II) acetate and DABCO to afford the corresponding carbamoylacetates in moderate to good yields.