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Lithium amide reacted with spiroketal enol ether characterized tonghaosu analog at -78 o C to give the only hydroamination product 4 in a highly regio- and diastereoselective manner. At a higher temperature, -40 o C, the presence of free amine was critical for the hydroamination to take place; otherwise, rearrangement of tonghaosu analog to 2,3-dihydrofuran derivative like 6 was the...
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