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Enantio and Diastereoselective Addition of Phenylacetylene to Racemic α-chloroketones

Alma Mater Studiorum, Dipartimento di Chimica “G: Ciamician”, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
Author to whom correspondence should be addressed.
Molecules 2011, 16(6), 5298-5314;
Received: 26 May 2011 / Revised: 17 June 2011 / Accepted: 22 June 2011 / Published: 23 June 2011
(This article belongs to the Special Issue Catalytic Asymmetric Synthesis)
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In this report, we have presented the first diastereoselective addition of phenylacetylene to chiral racemic chloroketones. The addition is controlled by the reactivity of the chloroketones that allowed the stereoselective reaction to be performed at –20 °C. Chiral racemic chloroketones are used in the reaction. By carefully controlling the temperature and the reaction time we were able to isolate the corresponding products in moderate yields and with good, simple and predictable facial stereoselection. Our reaction is a rare example of the use of chiral ketones in an enantioselective alkynylation reaction and opens new perspectives for the formation of chiral quaternary stereocenters. View Full-Text
Keywords: alkynylation; (R,R)-salen; chloroketones; Me2Zn; phenylacetylene alkynylation; (R,R)-salen; chloroketones; Me2Zn; phenylacetylene

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Alesi, S.; Emer, E.; Capdevila, M.G.; Petruzziello, D.; Gualandi, A.; Cozzi, P.G. Enantio and Diastereoselective Addition of Phenylacetylene to Racemic α-chloroketones. Molecules 2011, 16, 5298-5314.

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