Wang Y, Li Q, Song X, Wang J, Yin X, Li SS, Wang L. Chemoselective and diastereoselective construction of 4-alkylidene-tetrahydroquinoline
via a redox-neutral vinylogous cascade [1,7]-hydride transfer/6-
endo-trig cyclization strategy.
Org Biomol Chem 2023;
21:4007-4012. [PMID:
37128724 DOI:
10.1039/d3ob00223c]
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Abstract
Herein, we disclose a chemoselective and diastereoselective synthesis of the medicinally significant 4-alkylidene-tetrahydroquinoline via a redox-neutral vinylogous cascade condensation/[1,7]-hydride transfer/6-endo-trig cyclization strategy, which features a novel product skeleton, high chemoselectivity and diastereoselectivity, facile introduction of 4-alkylidenyl motifs, employment of α,β,γ,δ-unsaturated dicyanoalkenes as novel hydride acceptors, and green and metal-free conditions with water as the only by-product. Additionally, the versatility of α,α-dicyanoalkenes has been fully exploited as hydride acceptors and γ-exclusive nucleophiles consecutively for accessing novel heterocyclic skeletons.
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