期刊
RSC ADVANCES
卷 5, 期 53, 页码 42836-42842出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra04356e
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资金
- National Natural Science Foundation of China [20972070, 21421062]
- National Basic research Program of China (973 program) [2010CB833300]
- Program for New Century Excellent Talents in University [NCET-11-0265]
- Key laboratory of Elemento-Organic Chemistry
An efficient approach for the stereocontrolled construction of pyrano[2,3-c] pyrazole scaffold has been developed. Under the catalysis of a bifunctional squaramide derived from (1R, 2R)-1,2-diphenylethane-1,2-diamine, the asymmetric tandem Michael addition/cyclization reaction of 4-benzylidenepyrazol-5(4H)-ones and malononitrile proceeded efficiently to furnish the desired pyrano[2,3-c] pyrazoles in satisfactory yields with high levels of enantioselectivity (up to 99% ee).
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