l-Prolinal Dithioacetal: A Highly Effective Organocatalyst for the Direct Nitro-Michael Addition to Selected Cyclic and Aromatic Ketones

Autor:	Piotr Pomarański, Zbigniew Czarnocki
Rok vydání:	2019
Předmět:	010405 organic chemistry Organic Chemistry Aromatic ketones Enantioselective synthesis 010402 general chemistry Ring (chemistry) 01 natural sciences Medicinal chemistry Catalysis 0104 chemical sciences Ring size chemistry.chemical_compound chemistry Michael reaction Nitro Acetophenone
Zdroj:	Synthesis. 51:3356-3368
ISSN:	1437-210X 0039-7881
DOI:	10.1055/s-0037-1611531
Popis:	The synthesis of novel l-prolinal dithioacetal and its application as an organocatalyst for the direct Michael addition of cyclic ketones and acetophenone derivatives to trans-β-nitrostyrene and related compounds is described. The prolinal dithioacetal acts as effective catalyst in the case of cyclic ketones of different ring size, in particular five- and six-membered examples, as well as larger and smaller ring systems. High enantioselectivity and diastereoselectivity is observed for different substrates and trans-β-nitrostyrenes. Also, the first asymmetric syntheses of selected 2-methyl-4-nitro-1,3-diphenylbutan-1-one derivatives by application of the obtained organocatalyst is presented.
Databáze:	OpenAIRE
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