Alesi S, Emer E, Capdevila MG, Petruzziello D, Gualandi A, Cozzi PG. Enantio and Diastereoselective Addition of Phenylacetylene to Racemic α-chloroketones.
Molecules 2011;
16:5298-314. [PMID:
21701439 PMCID:
PMC6264675 DOI:
10.3390/molecules16065298]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 06/17/2011] [Accepted: 06/22/2011] [Indexed: 11/16/2022] Open
Abstract
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.
Collapse