acids have been regioselectively prepared from the corresponding bicyclic monoesters. The subsequent cyclisation by thionyl chloride produced the desired bridged azatricyclic anhydrides which are versatile substrates for the synthesis of dipeptides; they are also converted into oxathymine and oxauracil by a thermal [4+2] cycloreversion.
Stereocontrolled synthesis of some novel functionalized heterocyclic amino ester and amide derivatives with multiple stereocenters
作者:Anas Semghouli、Attila M. Remete、Loránd Kiss
DOI:10.1039/d3ra03866a
日期:——
The synthesis of some novel functionalized fused-ring β-amino lactones and lactams with multiple chiral centers has been attempted from readily available strained bicyclic β-amino acids via a stereocontrolled synthetic route. The key step was ring-rearrangement metathesis of allyl/propargyl esters or N-allylated/N-propargylated amides of (oxa)norbornene β-amino acids. The RRM transformations [ring-opening