Ce(SO4)2-catalysed the highly diastereoselective synthesis of tetrahydroquinolines via imino diels alder ABB’ type reaction and their in vivo toxicity and imaging in zebrafish embryos
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2016-03-30
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Abstract
An efficient and practical approach has been developed for the synthesis of N-(tetrahydroquinolinyl-4) amides 3a-l with
good yields and high diastereoselectivity. The strategy comprises the domino type ABB’ imino Diels Alder reaction catalysed
by a cerium(IV) salt between anilines and N-vinyl amides for the preparation of a 12-membered library of
tetrahydroquinolines that were tested for their in vivo toxicities against zebrafish embryos, determining their LC50 values
where N-(8-methoxy-2-methyl-tetrahydroquinolinyl-4) acetamide 3k was identified as the most toxic derivative with a LC50
below 95 μM (24 mg/L). Finally, the phenotypes induced, at concentrations below their LC50, were analyzed at 48, 72 and 96
hours post fertilization where the embryos treated manifested diverse visual phenotypes such as big yolk sacs (3b, 3h, 3j),
pericaldial edemas (3a, 3i) and red blood cells in the liver region (3b, 3l) in comparison to the morphology of the control
embryos, phenotypes that could be associated with specific biological targets.
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