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The TMSOTf catalyzed intramolecular [4+2] cycloaddition of in situ generated aza‐ o ‐quinone methide allows an expedient, stereoselective access to cis/trans ‐fused furo/pyrano[3,2‐ c ]tetrahydroquinolines with excellent yields and diastereoselectivity. The geometry of the dienophile olefin was found to have a profound effect on the stereochemical outcome of these reactions.
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Gharpure et al. (2019) studied this question.
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