Tetrahedron Asymmetry p. 2007 - 2013 (2005)
Update date:2022-08-05
Topics:
Mueller, Paul
Allenbach, Yves F.
Grass, Stefane
The performance of the [Rh2{(S)-ntt}4]-catalyst in comparison to [Rh2{(S)-pttl}4] and [Rh2{(S)- dosp}4] has been examined with allyl 2-diazo-3-silanyloxybut-3- enoates. The best results were obtained with [Rh2{(S)-pttl} 4], where enantioselectivity culminated at 89% ee at -78°C. [Rh2{(S)-ntt}4] was slightly less selective, while [Rh2{(S)-dosp}4] was found less suitable for these substrates. However, even the results obtained with [Rh2{(S)-pttl} 4] are much less satisfactory than those for the intramolecular cyclopropanation of allyl diazoacetates in the presence of [Rh 2{(S)-mepy}4].
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(2005)
