Molecules (Feb 2023)
Total Synthesis of Hemerocallisamine I Paved by Gram-Scale Synthesis of (2<i>S</i>,4<i>S</i>)-4-Hydroxyglutamic Acid Lactone
Abstract
Total synthesis of the 2-formylpyrrole alkaloid hemerocallisamine I is presented, both in racemic and enantiopure form. Our synthetic strategy involves (2S,4S)-4-hydroxyglutamic acid lactone as the key intermediate. Starting from an achiral substrate, the target stereogenic centers were introduced by means of crystallization-induced diastereomer transformation (CIDT) in a highly stereoselective fashion. A Maillard-type condensation was crucial to constructing the desired pyrrolic scaffold.
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