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Asymmetric syn-selective Henry reaction catalyzed by the sulfonyldiamine-CuCl-pyridine system.

The Journal of organic chemistry (2008-06-03)
Takayoshi Arai, Ryuta Takashita, Yoko Endo, Masahiko Watanabe, Akira Yanagisawa
ABSTRACT

A catalytic asymmetric Henry reaction has been developed with use of a sulfonyldiamine-CuCl complex as a catalyst. A series of new binaphthyl-containing sulfonyldiamine ligands (2a-h) were readily synthesized in two steps starting from commercially available chiral 1,2-diamines. The (R,R)-diamine-(R)-binaphthyl ligand (2d)-CuCl complex smoothly catalyzed the enantioselective Henry reaction with the assistance of pyridine to give the corresponding adduct with high enantiomeric excess (up to 93%). Moreover, the 2d-CuCl-pyridine system promotes the diastereoselective Henry reaction in syn-selective manner to give the adduct in up to 99% yield with 92:8 syn/ anti selectivity. The enantiomeric excess of the syn-adduct was 84% ee.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Copper(I) chloride, ≥99.995% trace metals basis
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Sigma-Aldrich
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