The first catalytic asymmetric exo′‐selective [3+2] cycloaddition of methyleneindolinones with iminoesters was achieved for construction of novel diastereomers of spiro[pyrrolidin‐3,3′‐oxindole]. By using the imidazoline–aminophenol‐ligand complex [Ni(OAc)2–(L1)], the reaction proceeds in the stepwise Michael–Mannich reaction to give the exo′ adducts as stable isomers (see scheme).
This invention relates to novel hybrid compounds, of formula 1 wherein R1 to R7, L and Y are as defined herein, wherein Y denotes a histone deacetylase inhibiting moiety (such as a heterocycle, hydroxamic acid or diamine) and L denotes a linker group the invention also relates to processes for preparing them and their use as therapeutic agents and diagnostic agents.
From oxindole with flow: Oxindole enolethers are engaged in microfluidic visible‐light Paternò–Büchi processes, allowing the concomitant C2‐C3 functionalisation of the biorelevant heterocyclic core, in high yield and selectivity.
A mild and efficient reaction of the Bestmann–Ohirareagent with N-unprotected isatin-derived olefins has been developed for the selective synthesis of spiro-pyrazoline-oxindoles and tricyclic pyrazoles. The reaction features an attractive product-selectivity depending on the substituent on isatin-derived olefin. Treatment of 3-aryl/alkylideneoxindoles with BOR afforded spiropyrazoline-oxindoles, whereas
PyBidine-Cu(OTf)<sub>2</sub>-Catalyzed Asymmetric [3+2] Cycloaddition with Imino Esters: Harmony of Cu-Lewis Acid and Imidazolidine-NH Hydrogen Bonding in Concerto Catalysis
(PyBidine)–Cu(OTf)2 complex catalyzing the endo‐selective [3+2] cycloaddition of nitroalkenes with imino esters was applied to the reaction of methyleneindolinones with imino esters to afford spiro[pyrrolidin‐3,3′‐oxindole]s in up to 98 % ee. X‐ray crystallographic analysis of the PyBidine–Cu(OTf)2 complex and DFT calculations suggested that an intermediate Cu enolate of the imino ester reacts with