A new synthesis of (+)-dicrotaline (1), an 11-membered dilactonic pyrrolizidine alkaloid of retronecine (6) type has been achieved in one step by utilizing a tinmediated lactonization process.
Synthesis and stereochemistry of dicrotaline, a macrocyclic pyrrolizidine alkaloid
作者:J. Alastair Devlin、David J. Robins
DOI:10.1039/c39810001272
日期:——
Dicrotaline (3) and its C-13 epimer (4) have been synthesized and the absolute configuration at C-13 of both alkaloids has been established by specific degradation of each epimer to optically active mevalonolactone.