Abstract
Abstract Diels-Alder reactions of 2-[(E)-β-alkoxyvinyl]-1,3,3-trimethyl-cyclohexenes with 2-methoxy-3-methyl-1,4-benzoquinone regioselectively produce adducts possessing the 12-methyl-podocarpane ring skeleton. In addition, in the reaction with 1,4-benzoquinone an unusual hetero Diels-Alder product involving the C[dbnd]O group of the quinone is found in low yield.
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