Enantioselective intramolecular cyclopropanation of allyl 2-diazo-3-silanyloxybut-3-enoates
摘要:
The performance of the [Rh-2{(S)-ntt}(4)]-catalyst in comparison to [Rh-2{(S)-ptt}(4)] and [Rh-2{(S)-dosp},(4)] has been examined with allyl 2-diazo-3-silanvloxybut-3-enoates. The best results were obtained with [Rh-2{(S)-ptt}(4)], where enantioselectivity culminated at 89% ee at -78 degrees C. [Rh-2{(S)-ntt}(4)] was slightly less selective, while [Rh-2{(S)-dosp}(4)] was found less suitable for these substrates. However, even the results obtained with [Rh-2{(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)]. (c) 2005 Elsevier Ltd. Ail rights reserved.
Enantioselective intramolecular cyclopropanation of allyl 2-diazo-3-silanyloxybut-3-enoates
摘要:
The performance of the [Rh-2{(S)-ntt}(4)]-catalyst in comparison to [Rh-2{(S)-ptt}(4)] and [Rh-2{(S)-dosp},(4)] has been examined with allyl 2-diazo-3-silanvloxybut-3-enoates. The best results were obtained with [Rh-2{(S)-ptt}(4)], where enantioselectivity culminated at 89% ee at -78 degrees C. [Rh-2{(S)-ntt}(4)] was slightly less selective, while [Rh-2{(S)-dosp}(4)] was found less suitable for these substrates. However, even the results obtained with [Rh-2{(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)]. (c) 2005 Elsevier Ltd. Ail rights reserved.
Intramolecular cyclopentene annulation. 3. Synthesis and carbon-13 nuclear magnetic resonance spectroscopy of bicyclic cyclopentene lactones as potential perhydroazulene and/or monoterpene synthons
作者:Tomas Hudlicky、D. Bhaskar Reddy、S. V. Govindan、Thomas Kulp、Bobbi Still、Jagdish P. Sheth
DOI:10.1021/jo00168a010
日期:1983.10
Enantioselective intramolecular cyclopropanation of allyl 2-diazo-3-silanyloxybut-3-enoates
作者:Paul Müller、Yves F. Allenbach、Stéfane Grass
DOI:10.1016/j.tetasy.2005.04.006
日期:2005.6
The performance of the [Rh-2(S)-ntt}(4)]-catalyst in comparison to [Rh-2(S)-ptt}(4)] and [Rh-2(S)-dosp},(4)] has been examined with allyl 2-diazo-3-silanvloxybut-3-enoates. The best results were obtained with [Rh-2(S)-ptt}(4)], where enantioselectivity culminated at 89% ee at -78 degrees C. [Rh-2(S)-ntt}(4)] was slightly less selective, while [Rh-2(S)-dosp}(4)] was found less suitable for these substrates. However, even the results obtained with [Rh-2(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)]. (c) 2005 Elsevier Ltd. Ail rights reserved.