Enantioselective Addition of Bromonitromethane to Aliphatic <i>N</i>-Boc Aldimines Using a Homogeneous Bifunctional Chiral Organocatalyst
作者:Kenneth E. Schwieter、Jeffrey N. Johnston
DOI:10.1021/acscatal.5b01901
日期:2015.11.6
This report details the enantioselectivesynthesis of β-amino-α-bromo nitroalkanes with β-alkyl substituents, using homogeneous catalysis to prepare either antipode. Use of a bifunctionalBrønstedbase/acid catalyst allows equal access to either enantiomer of the products, enabling the use of Umpolung Amide Synthesis (UmAS) to prepare the corresponding L- or D-α-amino amide bearing alkyl side chains—overall
A facile reaction of imines with telluronium allylide. Highly stereoselective synthesis of vinylaziridinesElectronic supplementary information (ESI) available: experimental section. See http://www.rsc.org/suppdata/cc/b4/b400464g/
作者:Wei-Wei Liao、Xian-Ming Deng、Yong Tang
DOI:10.1039/b400464g
日期:——
The reaction of telluronium allylides with alkylimines, generated in situ from alpha-amidoalkyl sulfones, affords cis-alkylvinylarizidines with good stereoselectivity in good yields. However, the same ylides react with N-aryl imines to provide trans-vinylaziridines.
A new access to substituted tetraethyl N-Boc 2-aminoethylidene-1,1-bisphosphonates and phosphonyl-substituted aza-Morita–Baylis–Hillman-type adducts
作者:Anna Gajda、Tadeusz Gajda
DOI:10.1016/j.tet.2007.11.072
日期:2008.2
A general one-pot synthesis of substituted 2-aminoethylidene-1,1-bisphosphonates has been developed. The protocol involves base-induced addition of sodium tetraethyl methylenebisphosphonate to N-Boc imines generated in situ from N-Boc-alpha-amidoalkyl-p-tolylsulfones by the action of sodium hydride. The direct and efficient conversion of the title compounds into aza-Morita-Baylis-Hillman-type adducts has been also elaborated. (c) 2007 Elsevier Ltd. All rights reserved.