916762-76-0Relevant academic research and scientific papers
Trans-2,5-Disubstituted pyrrolidines: Rapid stereocontrolled access from sulfones
Moloney, Mark G.,Panchal, Terry,Pike, Richard
, p. 3894 - 3897 (2008/09/18)
A direct method for the reliable synthesis of trans-2,5-distributed pyrrolidines from pyroglutamic acid that was conducted at scale and without chromatographic purification of key intermediates was investigated. An analogous reaction involving the partial reduction of succinimides and displacement of the resulting lactol with benzenesulfinic acid yields sulfonyl pyrrolidinones. It was found that a highly diastereoselective and general approach to 2,5-difunctionalized pyrrolidines could be achieved by applying this strategy to the pyroglutamate system. The four step synthesis required no chromatographic purification of intermediates, where the product sulfone was readily purified by recrystallization and the sequence proceeded in 52% overall yield. The results show that such an approach would be of great importance for the preparation of substituted pyrrolidines in natural product systems.
