Regioselective [2 + 2 + 2] Alkyne Cyclotrimerizations to Hexasubstituted Benzenes: Syntheses of Fomajorin D and Fomajorin S
作者:Amir Tavakoli、Gregory B. Dudley
DOI:10.1021/acs.joc.4c00224
日期:——
cyclotrimerizations of diynes with alkynes. These convergent and efficient benzannulations are directed toward and lead to the first total syntheses of the illudalane sequiterpenes fomajorin D and S, in 10 and 7 steps, respectively, from commercially available dimedone. Control experiments suggest that hydrogen bonding may play a role in preorganizing the diyne and alkyne coupling partners for establishing
六取代的苯环是通过二炔与炔的区域选择性双分子[2+2+2]炔环三聚反应制备的。这些收敛且高效的苯并环化旨在并导致首次从市售双甲酮全合成伊鲁达烷倍半萜fomajorin D和S,分别需要10和7个步骤。对照实验表明,氢键可能在预组织二炔和炔偶联伙伴以建立所需的区域选择性方面发挥作用,但其他因素可能参与其他区域异构体的选择性形成。