Abstract
First total synthesis of biologically active germacrane-type sesquiterpene (−)-diversifolin has been achieved. The features of the synthesis involve (i) ring-closing metathesis to give a 10-membered carbocycle, (ii) regioselective Mukaiyama aldol reaction of silyl dienol ether with formaldehyde at the α-position, and (iii) lactone transposition of the fully functionalized 11-oxabicyclo[6.2.1]undecane system.
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