CN-assisted oxidative cyclization of cyano cinnamates and styrene derivatives: a facile entry to 3-substituted chiral phthalides
作者:R. Santhosh Reddy、I. N. Chaithanya Kiran、Arumugam Sudalai
DOI:10.1039/c2ob25409c
日期:——
of o-cyano cinnamates and styrene derivatives leads to efficient construction of chiralphthalide frameworks in high optical purities. This unique reaction is characterized by unusual synergism between CN and osmate groups resulting in rate enhancement of the AD process. The method is amply demonstrated by the synthesis and the structural/stereochemical assignment of the natural products.
An Efficient Synthesis of Benzazocines by Gold(I)-Catalyzed Tandem 1,2-Acyloxy Shift/[3+2] Cycloaddition of Terminal 1,9-Enynyl Esters
作者:Shangbiao Feng、Zhengshen Wang、Weiwei Zhang、Xingang Xie、Xuegong She
DOI:10.1002/asia.201600593
日期:2016.8.5
effective synthesis of structurally diverse benzazocines was accomplished in good to excellent chemical yields (55–82 %) through a gold(I)‐catalyzed cascade reaction involving tandem 1,2‐acyloxy shift/[3+2] cycloaddition of terminal 1,9‐enynyl esters. The reaction proceeds under extremely mild conditions and represents one of the relatively few transition‐metal‐catalyzed intramolecular cycloaddition reactions
strategy of alkene-selective formalinsertion into a benzylic C−F bond, which enables late-stage modification of drug molecules. This transformation breaks a strong C−F bond and forms a somewhat weaker C−F bond at the same time, under mild conditions, thus providing an opportunity for straightforward access to partially fluorinated organic molecules via difunctionalization of alkenes.