4-Aminothioureaprolinal Dithioacetal as a Catalyst for Highly Enantioselective Michael Additions of Ketones and Aldehydes to Nitroolefins
4-Aminothioureaprolinal Dithioacetal as a Catalyst for Highly Enantioselective Michael Additions of Ketones and Aldehydes to Nitroolefins
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4-氨基硫脲脯氨醛二硫缩醛作为酮和醛与硝基烯烃的高对映选择性迈克尔加成催化剂
DOI:
10.1002/ejoc.201001211
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
Li-Yang Yin
中科院分区:
文献类型:
--
作者:
Yan-Mei Zhang;Yong-Ming Chuan;Yun-Gui Peng;Li-Yang Yin
4-Aminothioureaprolinal dithioacetal 4a is a highly efficient catalyst for the asymmetric Michael addition of ketones and aldehydes to nitroolefins requiring only 3 mol-% catalyst loading. The reactions proceeded smoothly and gave syn selective adducts with excellent yields (up to 98 % yield), diastereoselectivity (up to >99:1 dr), and enantioselectivity (up to 99 % ee) under solvent free conditions at room temperature. This extremely simple and practical procedure increases the attractiveness of this reaction.
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