(â)-Lentiginosine and its pyrrolizidinic analogue have been prepared in a straightforward five-step sequence from a versatile chiral cis-α,β-epoxyamine.
Asymmetric syntheses of (–)-lentiginosine and an original pyrrolizidinic analogue thereof from a versatile epoxyamine intermediate
作者:Tahar Ayad、Yves Génisson、Michel Baltas
DOI:10.1039/b505303j
日期:——
Ready access to natural (â)-lentiginosine and its pyrrolizidinic analogue from a chiral vinylic epoxyamine in a straightforward five-step sequence is presented. Careful use of the RCM reaction on aminotriols 5 and 6 constitutes the key feature of the synthetic pathway. The α-amyloglucosidase inhibitory activities of the target compounds were evaluated and showed that the more easily accessible pyrrolizidinic analogue possesses an inhibitory activity quite similar to that of (â)-lentiginosine.