The first total synthesis of enantiomerically pure (â)-indolizidine 239CD starting from the (R,R)-diepoxide building block 2 is described, which confirms its gross structure and absolute stereostructure.
General entry to the 3,5-disubstituted indolizidine class of dendrobatid alkaloids. Total syntheses of both enantiomers of indolizidines 195B, 223AB, 239AB, and 239CD from a common chiral synthon