Organic Letters p. 5601 - 5604 (2005)
Update date:2022-08-05
Topics:
Dion, Amelie
Dube, Pascal
Spino, Claude
(Chemical Equation Presented) An advanced intermediate to the highly oxygenated triterpene quassinoids was prepared in 14 steps from tetrahydrofuran. The key steps are three diene-transmissive Diels-Alder cycloadditions. Several features of this synthesis are noteworthy, including a successful Mitsunobu reaction on an allenylic alcohol, a rare [4 + 2] cycloaddition involving an enethiol ether dienophile, and complete control over all 10 chiral centers created.
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Doi:10.1021/acs.joc.7b01998
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