Journal
ORGANOMETALLICS
Volume 32, Issue 24, Pages 7431-7439Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om4009444
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- University of Pennsylvania
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Shibasaki's heterobimetallic complexes [M-3(THF)(n)]. [(BINOLate)(3)RE] (BINOLate = 1,1'-bi-2-naphtholate; RE = Ln(III), Y-III M = Li+, Na+, K+) are among the most general and highly enantioselective catalysts known. Their structures, however, have been limited to group I metals in the peripheral sites. We envisioned that the utility of this class of catalysts could be broadened by the synthesis of new members. Herein, we report the first synthesis of Shibasaki-type catalysts that incorporate divalent Zn2+ ions in the peripheral positions. The compounds (EtZn)(3)(THF)(2)(BINOLate)(3)RE(THF) (RE = La-III, Pr-III, Eu-III) are easily prepared from the corresponding tris(silylamide) precursors RE[N(SiMe3)(2)](3), 3 equiv of (S)-BINOL, and 3 equiv of ZnEt2 in 68-86% crystalline yields. The compounds are isostructural with known [Li-3(THF)(4)]-[(BINOLate)(3)RE(THF)] catalysts. We have demonstrated that the (EtZn)(3)(THF)(2)(BINOLate)(3)RE(THF) complexes are catalytically active in the enantioselective addition of diethylzinc to benzaldehyde with moderate enantioselectivities.
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