Synthesis of pachastrissamine (jaspine B) and its derivatives by the late-stage introduction of the C-2 alkyl side-chains using olefin cross metathesis
An improved divergent synthesis of the four diastereomers of pachastrissamine from Garner's aldehyde has been reported. The common intermediate was synthesized by an indium-mediated acetoxyallylation reaction. The long alkyl sidechain was introduced in the late stage of the synthesis using an olefin cross metathesis reaction. Biologicalevaluation of the chain modified analogs of the (2S,3S,4R)-isomer