The alkynylpyrrolidine 4 was made via a dearomatising cyclisation of an aromatic amide, and was elaborated by stannylcupration and palladium-catalysed coupling to achieve the first total synthesis of three members of the isodomoic acid family; the same alkyne can be envisaged as a precursor to several more of this class of amnesic shellfish toxins.
![(2S,3S,4S)-4-[(2E,5E)-6-carboxyhepta-2,5-dien-2-yl]-3-(carboxymethyl)pyrrolidine-2-carboxylic acid Structure](https://image.chemsrc.com/caspic/083/101977-25-7.png)
