VinylogousMukaiyama‐type aldolreactions have been catalyzed by a combination of Cu(OTf)2 and readily available C1‐symmetric aminosulfoximines. After a fine‐tuning of the reaction conditions and an optimization of the modularly assembled ligand structure, high stereoselectivities and excellent yields have been achieved in catalyzed reactions involving various electrophile/nucleophile combinations
Chiral sulfoximine/Pd-complexes catalyze enantioselective allylic alkylations. The corresponding products have been obtained in good yields with moderate enantioselectivities (up to 73% ee. The crystal structure of an allyl/Pd(II)-complex bearing a chelating sulfoximine is reported.
BINOL-derived N-phosphino sulfoximines as ligands for asymmetric catalysis
作者:Manfred T. Reetz、Oleg G. Bondarev、Hans-Joachim Gais、Carsten Bolm
DOI:10.1016/j.tetlet.2005.06.107
日期:2005.8
BINOL-derived N-phosphino sulfoximines have been prepared for the first time and tested as ligands in asymmetric transition metal catalysis. Up to 99% ee was achieved in the Rh-catalyzed asymmetric hydrogenation of functionalized olefins and up to 66% ee in the Pd-catalyzed allylic alkylation. (c) 2005 Elsevier Ltd. All rights reserved.
ortho-Lithiation of S-tert-butyl-S-phenylsulfoximines. New route to enantiopure sulfinamides via a de-tert-butylation reaction
The sulfoximine group proved to be an excellent ortho-directing group in lithiation reactions. Several electrophiles were used to afford the corresponding ortho-functionalized aryl sulfoximines in good yields. The use of prochiral electrophiles lead to modest to good diastereoselectivities up to 95%. During this study, we observed a side reaction due to a S-de-tert-butylation. After optimization of this S-de-tert-butylation reaction, the corresponding enantiopure sulfinamides could be obtained in good yields. (c) 2005 Elsevier Ltd. All rights reserved.