ABSTRACT An efficient and greener protocol for easy access to 3-susbstituted-3-hydroxy-2-oxindoles by the reaction with various substituted isatins and acetophenones is described. This protocol is widely applicable for a variety of isatins and acetophenones using water as a reaction media and 1,4-diazabicyclo[2.2.2]octane (DABCO) as catalyst with shorter reaction time and good to excellent yield of
In the presence of molecular sieve (MS) 4 Å in DMF, a catalyst-free aldol condensation of a variety of aromatic and aliphatic ketones with isatins under mild reaction conditions has been developed. This approach may provide access to a wide range of 3-substituted-3-hydroxyindolin-2-ones in good to excellent yields.
Oxidative ring expansion of 3-hydroxy-3-phenacyloxindoles using phenyliodine diacetate and molecular iodine: Synthesis of 2-hydroxy-2-aryl/alkyl-2,3-dihydroquinolin-4(1H)-ones
作者:Ashish C. Kavale、Amit H. Kalbandhe、Imran A. Opai、Atul A. Jichkar、Nandkishor N. Karade
DOI:10.1016/j.tetlet.2020.152631
日期:2021.1
Oxidation of tertiary alcohol of the type 3-hydroxy-3-phenacyloxindoles using the combination of phenyliodine diacetate and molecular iodine in methanol results in oxidative cleavage of C2-C3 bond to form isocyanate as an intermediate with its subsequent trapping by methanol to form ortho-carbamates of 1,3-diaryl carbonyl compounds which further undergoes concurrent cyclization to furnish 2-hydroxy-2-aryl/alkyl-2
A simple and directsynthesis of substituted2-phenylquinoline-4-carboxamidesfrom 3-substituted-3hydroxyindolines in presence of ammonium acetate is described. The developed protocol also allows synthesis of the carboxamide moeity directly from isatin and acetophenone in one pot under optimized conditions. The protocol has the merits of simple reaction conditions, easy work up process and good yields