Pd(II) complexes of monodentate deoxycholic acid derived binaphthyl diamido phosphites as chiral catalysts in the asymmetric Suzuki-Miyaura cross-coupling
Chiral binaphthyl diamidophosphites derived from deoxycholic acid were synthesized and used as ligands for the preparation of mononuclear Pd(II) complexes, which were employed as catalysts in the asymmetric Suzuki-Miyaura cross-coupling of arylboronic acids with aryl bromides. Among the different reaction parameters, the substrate concentration emerged as being crucial for the outcome of the reaction: the reaction was faster in a concentrated reaction mixture, and could be performed at 0 degrees C, where the reaction promoted by the Pd-complexes was more enantioselective affording cross-coupling products with ee up to 70%. (C) 2017 Elsevier Ltd. All rights reserved.
Deoxycholic acid derived monophosphites as chiral ligands in the asymmetric Suzuki–Miyaura cross-coupling
作者:Varsha R. Jumde、Anna Iuliano
DOI:10.1016/j.tetasy.2011.12.006
日期:2011.12
Biaryl phosphites derived from deoxycholic acid were used as chiral ligands in the asymmetric Suzuki-Miyaura cross-coupling of arylboronic acids with aryl bromides. Amongst the different reaction parameters, the role of the base emerged as being crucial for the outcome of the reaction: the choice of base, and its amount, allowed enantiomerically enriched biaryl derivatives to be obtained at 1% catalyst loading and with an L:Pd ratio of 1:1. (C) 2011 Elsevier Ltd. All rights reserved.
TfOH-Catalyzed Intramolecular Annulation of 2-(Aryl)-Phenyl-Substituted <i>p</i>-Quinone Methides under Continuous Flow: Total Syntheses of Selaginpulvilin I and Isoselagintamarlin A
作者:Yogesh A. Pankhade、Rajat Pandey、Shaheen Fatma、Feroz Ahmad、Ramasamy Vijaya Anand
DOI:10.1021/acs.joc.1c02980
日期:2022.3.4
1,6-conjugate arylation of 2-(aryl)-phenyl-substituted p-quinone methides (QMs) under continuous flow using the microreaction technique. This method was found to be very effective for most of the p-QMs, and the corresponding 9-aryl fluorene derivatives were obtained in moderate to excellent yields. Moreover, this protocol was further elaborated to the first total syntheses of selaginpulvilin I and isoselagintamarlin