Ruthenium-Catalyzed [3 + 2] Cycloaddition of 2<i>H</i>-Azirines with Alkynes: Access to Polysubstituted Pyrroles
作者:Tengfei Li、Hao Yan、Xincheng Li、Chunxiang Wang、Boshun Wan
DOI:10.1021/acs.joc.6b02322
日期:2016.12.2
A ruthenium-catalyzed intermolecular [3 + 2] cycloaddition of 2H-azirines and activated alkynes is reported, which provides polysubstituted pyrroles in moderate to good yields. This approach features a C–N bond cleavage of 2H-azirines by a ruthenium catalyst. The results of this study would provide a complementary method to synthesize polysubstituted pyrroles from the known 2H-azirine approaches and
We developed, for the first time, the cinchona-alkaloid-catalyzed enantiodivergent α-fluorination of β-keto diarylphosphine oxides, which resulted in two enantiomers bearing fluorine-containing quaternary stereocenters.
novel method for concisely synthesizing1,2,4-triazolines via [3+2] cyclization under visible light is reported. These compounds can be easily converted into 1,2,4-triazoles under basic or photoredox conditions. The application of the 1,2,4-triazoles was also investigated via mild operations.
Ruthenium-Catalyzed C−C Bond Cleavage of 2<i>H</i>
-Azirines: A Formal [3+2+2] Cycloaddition to Fused Azepine Skeletons
作者:Tengfei Li、Fen Xu、Xincheng Li、Chunxiang Wang、Boshun Wan
DOI:10.1002/anie.201510820
日期:2016.2.18
2H‐azirines can serve as three‐atom synthons by C−C bond cleavage, however, it involves a high energy barrier under thermal conditions (>50.0 kcal mol−1). Reported is a ruthenium‐catalyzed [3+2+2] cycloaddition reaction of 2H‐azirines with diynes, thus leading to the formation of fused azepine skeletons. This approach features an unprecedented metal‐catalyzed C−C bond cleavage of 2H‐azirines at room