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The use of different amide bases such as NaHMDS or LiHMDS for an improved regioselectivity during the enolate formation in α-bromopiperidinone 1b,c led to complete decomposition of the substrates.
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3P in significant amounts to the catalytic cocktail led to an increased formation of side products.
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1H NOESY NMR experiments in which interactions beween the pro tons of the methyl group at C13 and the proton at C8 as well as between the proton at C7 and the proton at C8 were observed.
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52
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