A mild and efficient CAN mediated oxidation of Morita–Baylis–Hillman adducts of 5-methyl-N-alkylisatin to 5-formyl-N-alkylisatin
摘要:
A simple, mild and efficient CAN mediated oxidation of Morita-Baylis-Hillman adducts of 5-methyl-N-alkylisatins 1a-13a to 5-formyl-N-alkylisatins lb-13b under ambient reaction conditions is reported. Simple and isomerized 5-methyl-N-alkylisatin derivatives 1-4 have also been tested and failed to provide the corresponding formylated products. A plausible reaction mechanism has been proposed. (C) 2008 Elsevier Ltd. All rights reserved.
An efficient synthesis of non-natural, diastereoselective, α-hydroxyoxoindolin appended β-aminoester derivatives has been demonstrated from unprotected Morita-Baylis-Hillman (MBH) adducts of oxindole via simple aza-Michael addition strategy. The judicious choice of sodium hydride and bulky 2,4,6-triisopropylbenzenesulphonamide provided a controlled and diastereoselective addition products with MBH