Shi M, Duan WL, Rong GB. Axially dissymmetricN-thioacylated (S)-(-)-1,1?-binaphthyl-2,2?-diamine ligands for copper-catalyzed asymmetric Michael addition of diethylzinc to ?,?-unsaturated ketone.
Chirality 2004;
16:642-51. [PMID:
15455445 DOI:
10.1002/chir.20086]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Axially chiral thioamide ligands L5, L6, L8, L11, and bis(thioamide) ligand L13 were prepared from the reaction of (S)-(-)-1,1'-binaphthyl-2,2'-diamine with acyl chlorides and phosphorus pentasulfide (P2S5). The catalytic asymmetric 1,4-addition of diethylzinc to alpha,beta-unsaturated ketones was examined using this novel chiral ligand system with 28-73% ee in moderate to good yields.
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