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Trost’s Synthesis of The Spiroketal Subunit of (−)-Calyculin A. Cp=η5-cyclopentadienyl, (DHQD)PHN=dihydroquinidine 9-O-(9′-phenanthryl) ether, DIBALH=diisobutylaluminum hydride, PDC=pyridinium dichromate, TFA=trifluoroacetic acid, TsOH=p-toluenesulfonic acid.
