An enantioselective synthesis of α-alkylated pyrroles <i>via</i> cooperative isothiourea/palladium catalysis
作者:W. Rush Scaggs、Toya D. Scaggs、Thomas N. Snaddon
DOI:10.1039/c8ob02600a
日期:——
Herein we describe the direct enantioselective Lewis base/Pd catalysed α-allylation of pyrrole acetic acid esters. This provides high isolated yields of highly enantioenriched products and exhibits broad reaction scope with respect to both reaction partners. The products can be readily elaborated in a manner which points towards potential applications in target directed synthesis.
A Regio‐ and Stereodivergent Synthesis of Homoallylic Amines by a One‐Pot Cooperative‐Catalysis‐Based Allylic Alkylation/Hofmann Rearrangement Strategy
作者:Colin M. Pearson、James W. B. Fyfe、Thomas N. Snaddon
DOI:10.1002/anie.201905426
日期:2019.7.29
Herein, we report a modular synthetic route to linear and branched homoallylic amines that operates through a sequential one-pot Lewis base/transition-metal catalyzed allylic alkylation/Hofmann rearrangement strategy. This protocol is operationally trivial, proceeds from simple and easily prepared substrates and catalysts, and enables all aspects of regio- and stereoselectivity to be controlled through
Enantioenriched tertiary and quaternary α-chiral allylsilanes have been obtained by metal-free asymmetric allylic alkylation of γ-substituted primary allylic bromides with primary alkyl Grignard reagents activated by a chiral Alexakis-type NHC ligand.
New N-alkyl, alkenyl and benzyl substituted DNJ derivatives incorporating a silicon atom in the substituent were synthesised. Kinetic parameters (K-i, t(1/2)) for inhibition of rat intestinal alpha-glucohydrolases as well as human lysosomal alpha-glucosidases were measured. New DNJ derivatives are potent and selective inhibitors of intestinal alpha-glucohydrolases. (C) 1997, Elsevier Science Ltd.