合成路线1

Propargyl alcohol (I) is oxidized with CrO3 under reduced pressure to give propynal (II), which is treated with sodium thiosulfate to afford the aldehyde dithionite (III). Subsequent cyclization of (III) in liquid ammonia gives rise to isothiazole (IV). The lithiated derivative of (IV) is formylated by means of DMF to provide aldehyde (V), which is further reduced to alcohol (VI) employing NaBH4 in THF (1). Bromination of alcohol (VI) in the presence of CBr4/PPh3 leads to 5-bromomethylisothiazole (VII). This is then converted into the phosphonium salt (VIII) upon treatment with triphenylphosphine in refluxing acetonitrile. Wittig condensation of (VIII) with the formyl pyrrolidine (IX) produces the ethenylpyrrolidine derivative (X). The mesylate group of (X) is displaced with potassium thioacetate to produce thioester (XI), which is subsequently hydrolyzed to thiol (XII) with methanolic NaOH. Condensation of thiol (XII) with the enol phosphate (XIII) in the presence of diisopropylethylamine affords the protected carbapenem derivative (XIV). This is finally deprotected with Bu3SnH and palladium catalyst to furnish the title compound (1,2)