Journal
TETRAHEDRON-ASYMMETRY
Volume 21, Issue 23, Pages 2788-2793Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetasy.2010.11.012
Keywords
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Funding
- National Natural Science Foundation of China [20343005, 20473107, 20673130, 20773147]
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Novel chiral diphosphite ligands derived from glucopyranoside and H-8-binaphthol were synthesized, and successfully employed in the Cu-catalyzed asymmetric 1,4-addition of organozinc reagents dimethylzinc, diethylzinc, and diphenylzinc to cyclic and acyclic enones with up to 96% ee. The stereochemically matched combination of D-glucopyranoside backbone and (R)-H-8-binaphthyl in the ligand 2,4-bis{[(R)-1,1'-H-8-binaphthyl-2,2'-diyl] phosphite)-phenyl 3,6-anhydro-beta-D-glucopyranoside was essential for inducing high enantioselectivity. A significant dependence of stereoselectivity on the type of enones and the ring size of cyclic enones was observed. Moreover, the sense of the enantiodiscrimination of the products was mainly determined by the configuration of the H-8-binaphthyl moieties. (C) 2010 Elsevier Ltd. All rights reserved.
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