A 1,3-dipolar cycloaddition of alicyclic methylene iminium ylide to form pyrrolizidine nuclei and its application to synthesis of pyrrolizidine alkaloids.
A 1,3-dipolar cycloaddition of alicyclic methylene iminium ylide to form pyrrolizidine nuclei and its application to synthesis of pyrrolizidine alkaloids.
Efficient synthesis of pyrrolizidines and indolizidines has been achieved by reacting tetracyclic hexahydro-1, 3, 5-triazines with olefinic and acetylenic compounds in the presence of trimethylsilylmethyl trifluoromethanesulfonate and cesium fluoride. This reaction was applied to the synthesis of several pyrrolizidine alkaloids, (±)-trachelanthamidine, (±)-supinidine, and (±)-isoretronecanol.