Cg. Logie et al., CONFIRMATION OF THE STEREOCHEMISTRY OF 7-BETA-ANGELYL-1-METHYLENE-8-ALPHA-PYRROLIZIDINE, South African Journal of Chemistry, 50(2), 1997, pp. 72-74
The (7R,8R) stereochemistry of naturally occurring 7 beta-angelyl-1-me
thylene-8 alpha-pyrrolizidine 5 was confirmed by subjecting a mixture
of a synthetic standard and the natural product to various chiral diff
erentiating techniques. The synthetic 7 beta-angelyl-1-methylene-8 alp
ha-pyrrolizidine 1 was prepared from enantiomerically pure retronecine
3.