Indium-Mediated Organometallic Reactions in Aqueous Media. Stereoselectivity in the Crotylation of Sulfonimines Bearing a Proximal Chelating Group
作者:Wenshuo Lu、Tak Hang Chan
DOI:10.1021/jo0018038
日期:2001.5.1
Reaction of sulfonimines having proximal chelating groups with crotyl bromide and indium in aqueousmedia gave alpha-crotylation products stereoselectively with syn-selectivity.
The polyamine alkaloid cannabisativine was synthesized as an optical active form. The key step is the hetero Diels-Alderreaction of chiral diene and an N-tosylimine, in which regio- and diastereo-face selectivities were completely controlled, only one diastereomer was isolated in high yield. Synthesized (−)-cannabisativine has the same physical data as the natural product except for the αD value.
Ene reaction of the active imino group. A novel synthesis of α-amino-acids
作者:Osman Achmatowicz、Marek Pietraszkiewicz
DOI:10.1039/p19810002680
日期:——
The thermal (120 °C) and catalytic (SnCl4,BF3, and AlCl3) ene addition reactions of butyl N-(p-tolylsulphonyl)-iminoacetate with alkenes give adducts which are readily convertible into,γδ-unsaturatedα-amino-acids.