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Direct and Enantioselective Vinylogous Michael Addition of α-Alkylidenepyrazolinones to Nitroolefins Catalyzed by Dual Cinchona Alkaloid Thioureas

✍ Scribed by Rassu, Gloria; Zambrano, Vincenzo; Pinna, Luigi; Curti, Claudio; Battistini, Lucia; Sartori, Andrea; Pelosi, Giorgio; Casiraghi, Giovanni; Zanardi, Franca

Book ID: 124081184
Publisher: John Wiley and Sons
Year: 2014
Tongue: English
Weight: 534 KB
Volume: 356
Category: Article
ISSN: 1615-4150
DOI: 10.1002/adsc.201300964

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## Abstract A highly enantioselective Michael reaction of aromatic ketones with nitroolefins was accomplished in the presence of a chiral bifunctional primary amine–thiourea catalyst and 4‐nitrobenzoic acid as the co‐catalyst; the corresponding adducts were obtained in excellent enantioselectivitie