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Tetrahedron Letters, Volume 48, Issue 1, 1 January 2007, Pages 21-24
Michael additions in water of ketones to nitroolefins catalyzed by readily tunable and bifunctional pyrrolidine–thiourea organocatalysts
Yi-Ju Caoa, Yuan-Yuan Laia, Xiang Wanga, b, Yong-Jian Lia and Wen-Jing Xiao
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http://dx.doi.org/10.1016/j.tetlet.2006.11.037Большое спасибо!