Rambaud F, Guillot R, Alezra V, Kouklovsky C. Diversity in the Synthesis of Functionalized Cyclohexene Oxide Derivatives by a Cycloaddition-Fragmentation Sequence from Benzene Oxide.
J Org Chem 2023. [PMID:
37126402 DOI:
10.1021/acs.joc.3c00398]
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Abstract
A cycloaddition-fragmentation sequence from benzene oxide and a nitroso- or azo-dienophile was investigated as a tool for access to highly substituted cyclohexene oxide derivatives. Alkyl lithium-promoted fragmentation of the cycloadducts led to the cyclic derivatives after 1,4- or 1,2-addition of a second equivalent of the lithium reagent. New fragmentation processes were observed when using non-nucleophilic bases of highly hindered alkyl lithium reagents. All reactions proceeded with complete stereocontrol.
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