e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
Enantioselective tandem formation and [2, 3]??sigmatropic rearrangement of cyclic propargylic oxonium ylides catalyzed by dirhodium (II) tetrakis [N??phthaloyl??(S)??tert?? …
…, S Nakamura, M Nakajima, S Kitagaki…
Index: Tsutsui, Hideyuki; Matsuura, Maya; Makino, Kazuishi; Nakamura, Seiichi; Nakajima, Makoto; Kitagaki, Shinji; Hashimoto, Shunichi Israel Journal of Chemistry, 2001 , vol. 41, # 4 p. 283 - 295
Abstract This paper describes the first examples of catalyst-dependent asymmetric induction in the periselective [2, 3]-sigmatropic rearrangement of propargylic oxonium ylides generated by catalytic diazo decomposition. Catalysis of α-diazo-ß-keto esters 4a—g using dirhodium (II) tetrakis [N-phthaloyl-(S)-tert-leucinate] in toluene has led to the virtually exclusive formation of benzofuran-3-ones bearing an allenic group with up to 79% ee.
