Pd/Pivalic Acid Mediated Direct Arylation of 2-Pyrones and Related Heterocycles
作者:Leticia M. Pardo、Aisling M. Prendergast、Marie-T. Nolan、Eoin Ó Muimhneacháin、Gerard P. McGlacken
DOI:10.1002/ejoc.201500262
日期:2015.6
Directarylation represents a favourable alternative to traditional cross-coupling reactions and has found widespread use with simple aryls and robust heterocycles. Herein a directarylation protocol has been optimised and applied to more delicate, privileged biological motifs. The intramolecular directarylation of 2-pyrones, 2-coumarins, 2-pyridones and 2-quinolones occurs in very good to excellent
Tosyl cyanide as a C-sulfinylating agent: 3-sulfinylation of 4-hydroxycoumarins and related heterocycles
作者:Ramulu Akula、Hasim Ibrahim
DOI:10.1039/c3ra45987j
日期:——
Treatment of 4-hydroxycoumarins and related heterocycles with TsCN under mild basic reaction conditions produces the corresponding 3-sulfinylated products in high yields. Sulfinyl transfer is proposed to occur from sulfinyl cyanate 1, generated in situ by base-catalysed rearrangement of TsCN.
The palladium‐catalyzedselectivecarbofunctionalization of inertγ‐C(sp3)−Obonds of aliphatic amides by using the strategy of sp3 C−H activation/β‐O elimination/hydrocarbofunctionalization with the assistance of 8‐aminoquinolyl directing group is presented here. This method features a broad scope of both 4‐hydroxypyridin‐2(1H)‐ones and 4‐hydroxy‐2H‐pyran‐2‐ones, providing a versatile method for the
A highly efficient approach to polysubstituted 2-aminopyrroles containing a coumarin derivative unit at the 5-position of the pyrrole ring was developed via a novel multicomponent dominoreaction of glyoxal monohydrate derivatives, anilines, coumarin derivatives, and malononitrile. This transformation proceeded via an α-aminoketone as the key intermediate.