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The base-catalyzed cycloaddition and double Michael cyclization of substituted Nazarov reagents and of 1-phenylsulfinyl analogs, with 2-carbomethoxy-2-cyclohexen-1-one 1 yielding cis-decalins is reported. The reaction is highly stereoselective affording cis,cis- or cis, trans-decalins. Mechanistic aspects are briefly discussed.
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Lavallée et al. (1992) studied this question.
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