Synthesis of Chiral Indolizines as Bicyclic Ergoline Analogues
摘要:
An efficient synthesis of the enantiomerically pure aminoindolizine (3) by a triflic anhydride assisted cyclization of the 1,3-amino alcohol (6) is reported. 6 can be readily derived from L-asparagine (4) via the O-activated beta-homoserine equivalent (7).