Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 355, Issue 5, Pages 1001-1008Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201200672
Keywords
aryl addition; aryltitaniums; enantioselectivity; ketones; titanium
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Funding
- National Science Council of Taiwan [NSC 99-2113M-005-005-MY3]
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Aryl addition reactions of ArTi(O-i-Pr)3 to aromatic, heteroaromatic, or ,-unsaturated ketones are described, producing tertiary alcohols in good to excellent enantioselectivities of up to 97% ee. The structure of the dititanium complex [(i-PrO)2Ti{-(S)-BINOLate}(-O-i-Pr)TiPh(O-i-Pr)2] [(S)-4] that simultaneously bears a chiral directing ligand and a nucleophile is reported. Complex (S)-4 possesses a pocket structure and has been illustrated as the key active species for addition reactions of both aldehydes and ketones. Mechanistic and stereochemical insights concerning addition reactions of organometallic reagents to organic carbonyls are rationalized based on the pocket structure and pocket size of (S)-4.
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