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Highly enantioselective addition of diethylzinc to aldehydes catalyzed by a new chiral C2-symmetric Ti–diol complex

✍ Scribed by Xiao-wu Yang; Jian-heng Shen; Chao-shan Da; Heng-shan Wang; Wu Su; Da-xue Liu; Rui Wang; Michael C.K Choi; Albert S.C Chan

Publisher
Elsevier Science
Year
2001
Tongue
French
Weight
88 KB
Volume
42
Category
Article
ISSN
0040-4039

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Enantioselective addition of diethylzinc
Enantioselective addition of diethylzinc to aromatic aldehydes catalyzed by Ti(IV) complexes of C2-symmetrical chiral BINOL derivatives
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Enantioselective addition of diethylzinc to a series of aromatic aldehydes is developed using new chiral C 2 -symmetric ligand (S)-2,2 0 -(1,1 0 -binaphthyl-2,2 0 -diylbis(oxy))bis(methylene)bis(4-nitrophenol) (S)-2b. The catalytic system employing 10 mol % of (S)-2b and 120 mol % of Ti(OiPr) 4 was

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The enantioselective addition of diethylzinc to aldehydes was conveniently achieved by using a catalyst prepared in situ by mixing titanium tetraisopropoxide with Sor R-binaphthol. Optical yields as high as 95.6% were obtained, t~) 1997 Elsevier Science Ltd. All rights reserved.