Tetrahedron p. 3867 - 3876 (1992)
Update date:2022-08-05
Topics:
Szymoniak
Besancon
Moise
Benzaldehyde (1a) and acetophenone (6) are shown to undergo highly stereoselective reductive couplings by NbCl3(DME). When the reaction is performed at -10°C, the threo diols can be isolated. The intermediate niobiopinacols reveal the ability of subsequent transformations, due to the Lewis acid properties of the reagent used. Starting from 1a stereospecific acetalization leads to threo-2,4,5-triphenyl-1,3-dioxolane (3a), whereas 3,3-diphenyl-2-butanone (7) is obtained from 6 in a pinacol-pinacolone type rearrangement. Alkenes may also be formed in the competing, temperature controlled deoxygenation. The stereoselectivity and the easy control of NbCl3(DME) mediated reactions make it a promising reagent for further synthetic applications.
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Doi:10.1007/s11164-013-1108-1
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(1992)Doi:10.1016/j.tetlet.2013.01.095
(2013)