期刊
ORGANIC & BIOMOLECULAR CHEMISTRY
卷 13, 期 20, 页码 5636-5645出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ob02653e
关键词
-
资金
- National Natural Science Foundation of China [21272024]
An efficient chiral squaramide-catalysed enantioselective Michael addition of pyrazolin-5-ones to 3-nitro-2H-chromenes for the synthesis of chiral heterocyclic systems containing both chroman and pyrazolone derivatives has been developed. This reaction afforded the desired products in high to excellent yields (up to 98%) with high enantioselectivities (up to 96%) and excellent diastereoselectivities (up to 99 : 1) under very low catalyst loading (0.2 mol%). This catalytic asymmetric reaction provides an efficient route toward the synthesis of chiral heterocyclic systems containing both chroman and pyrazolone derivatives, which possess potential pharmaceutical activities.
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