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The synthesis of an advanced intermediate in the synthesis of the tit
le compound has been achieved. Key steps inc
lude an Ire
land-C
laisenrearrangement to insta
ll the C7 tertiary a
lcoho
l stereocenter, an S
N2' reaction of an a
lkoxymethy
l Cu reagent, and a diastereose
lective Re-cata
lyzed a
lly
lic a
lcoho
l transposition.