Published as part of the Special Topic Heterocycles as Catalysts, Ligands, and Targets
Abstract
A simple and convenient method for the synthesis of bis-functionalised pyrrolizidines starting from readily available N-Cbz-l-prolinal is described. This aldehyde was converted within two concise steps to the corresponding aminoepoxides, which were separately subjected to regioselective cyclisation induced by a reductive cleavage of the Cbz protecting group. The versatile and concise strategy holds great potential for practical application in the straightforward preparation of pyrrolizidine-based drugs and natural products.
Key words
alkaloids - heterocycles - diastereoselective synthesis - asymmetric epoxidation - cyclisation - tandem reaction