Preparation of both enantiomers of cyclopropane derivatives from the reaction of vinyl selenones with di-(−)-bornyl malonate
摘要:
The reaction of vinyl selenones with di-(-)-bornyl malonate and sodium hydride occurred with low diastereoselectivity and afforded a mixture of two diastereomeric cyclopropane derivatives in comparable yields. These, however, could be easily separated by chromatography. Removal of the bornyl group afforded highly enantiomerically enriched cyclopropanes. An example of the simple conversions of these cyclopropanes into useful cyclopropane alpha-amino acids is also illustrated. The syntheses of several vinyl selenides and selenones are also described. (C) 2009 Elsevier Ltd. All rights reserved.
One-pot synthesis of aziridines from vinyl selenones and variously functionalized primary amines
作者:Silvia Sternativo、Francesca Marini、Francesca Del Verme、Antonella Calandriello、Lorenzo Testaferri、Marcello Tiecco
DOI:10.1016/j.tet.2010.06.055
日期:2010.8
Variously substituted aziridines were conveniently prepared by an aza-Michael Initiated Ring Closure (aza-MIRC) reaction starting from vinyl selenones and primary amines, aminoalcohols or diamines. The reactions proceed in very high yields at room temperature in toluene or water. A significant rate acceleration was observed under aqueous conditions.