期刊
ACS MACRO LETTERS
卷 6, 期 7, 页码 705-710出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.7b00352
关键词
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资金
- JSPS KAKENHI Grant [JP15H05811]
- Grants-in-Aid for Scientific Research [15H05811] Funding Source: KAKEN
Helical poly(quinoxaline-2,3-diyl)s copolymers PQXbpy consisting of a coordinating unit, which bears a varied achiral, substituted 2,2'-bipyridyl pendant, and a chiral unit bearing chiral side chains were synthesized and used as a ligand in copper-catalyzed asymmetric cyclopropanation of olefins with diazoacetates, giving up to 91:9 er with high chemical yield. The enantioselection relied on the helical structure of PQXbpy. A single PQXbpy afforded either of a pair of enantiomers with high enantioselectivity by switching its helical sense by changing the reaction solvent from pure toluene to a 3/1 mixture of toluene and 1,1,2-trichloroethane.
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