The chemistry of cyclic tautomers of tryptophan: Total synthesis of (+)-(ent)-pseudophrynaminol
摘要:
A diastereoselective synthesis of the unnatural (+)-enantiomer of the hexahydropyrroloindole alkaloid (-)-pseudophrynaminol (3), isolated from the skin of the Australian frog Pseudophryne coriacea, from a cyclic tautomer (1) of L-tryptophan, is described, The CD spectrum of the synthetic 3 is opposite in sign to that of the natural material enabling the configuration of the natural product to be established as 3aS,8aR.