The reactions of chiral 3-(2,2-dimethyl-1,3-dioxolan-4-yl)-2-propenoate est
ers 2-5 with NsONHCO(2)Et and CaO, produce the aziridine derivatives by add
ition of (ethoxycarbonyl)amino group on the double bond. The stereoselectiv
ity is good for trans substrates. Products are precursors to polyhydroxy am
ino acids.double dagger (C) 2000 Elsevier Science Ltd. All rights reserved.