Palladium-Catalyzed Cross-Coupling of <i>N</i>-Sulfonylaziridines and Alkenylboronic Acids: Stereospecific Synthesis of Homoallylic Amines with Di- and Trisubstituted Alkenes
作者:Wei Pin Teh、Forrest E. Michael
DOI:10.1021/acs.orglett.7b00504
日期:2017.4.7
palladium-catalyzed cross-coupling of 2-alkylaziridines with alkenylboronic acids to give homoallylamines is presented. The reaction is highly regioselective and stereospecific and provides convenient access to enantioenriched amines with 1,1-disubstituted, 1,2-disubstituted, and trisubstituted alkenes. The modular synthesis of a 2,5-disubstituted pyrrolidine natural product was completed in three steps
Stereodivergent Access to <i>Cis-</i> and <i>Trans</i>-3,5-Disubstituted 1,4-Thiazane 1-Oxides by Cyclization of Homochiral β-Amino Sulfoxides and Sulfones. The Preparation of Isomeric Ant Venom Alkaloids
作者:Stefan C. Söderman、Adrian L. Schwan
DOI:10.1021/ol4023003
日期:2013.9.6
Intramolecular conjugate additions of homochiral (E)-1-alkenyl 2-aminoalkyl sulfoxides and sulfones were investigated. The relative position of the 3,5-substituents of the resulting 1,4-thiazane oxides was found to be dependent on the oxidation state of the sulfur atom, demonstrating a simple and highly stereodivergent synthetic protocol. Selected cis- and trans-3,5-disubstituted 1,4-thiazane dioxides were converted to cis- and trans-2,5-disubstituted pyrrolidines, known ant venom alkaloids.