Synthesis of the Tetracyclic Core (ABCE Rings) of Daphenylline
作者:Bowen Fang、Huaiji Zheng、Changgui Zhao、Peng Jing、Huilin Li、Xingang Xie、Xuegong She
DOI:10.1021/jo301533f
日期:2012.9.21
A concise synthesis of the tetracyclic core (ABCE rings) of daphenylline has been accomplished involving a benzobicyclo[3.3.1] lactam as the key intermediate. This bridged bicyclic intermediate was efficiently constructed via a Brønstedacid promoted intramolecular Friedel–Crafts type Michaeladdition of a δ-benzyl α,β-unsaturated δ-lactam.
Stereoselective Syntheses of Four Diastereomers of 3,9,12-Trihydroxycalamenene via a Benzobicyclo[3.3.1] Intermediate
作者:Yongquan Sun、Binxun Yu、Xiaolei Wang、Shibing Tang、Xuegong She、Xinfu Pan
DOI:10.1021/jo1008349
日期:2010.6.18
The highly stereoselectivesyntheses of four diastereomers of natural 3,9,12-trihydroxycalamenene are described. The syntheses highlight the utility of an unusual framework of benzobicyclo[3.3.1] lactones, which were accomplished via an intramolecular Friedel−Crafts-type Michael addition of α,β-unsaturated lactones.
Efficient Synthesis of Dimeric Oxazoles, Piperidines and Tetrahydroisoquinolines from <i>N</i>
-Substituted 2-Oxazolones
作者:Yun He、Piyush K. Agarwal、I. N. Chaithanya Kiran、Ruocheng Yu、Bei Cao、Cheng Zou、Xinghua Zhou、Huacheng Xu、Biao Xu、Lei Zhu、Yu Lan、K. C. Nicolaou
DOI:10.1002/chem.201601471
日期:2016.6.1
practical method for the construction of heterocycles from N‐substituted 2‐oxazolonesthrough cascade, BF3⋅Et2O/H2O‐catalyzed reactions involving iminium ion generation and trapping by external or internal olefinic and aryl moieties is described. Mechanistic and computational studies revealed the strong protic acid HBF4 as the initiating catalyst for these cascade reactions. Providing access to novel molecular
为杂环的来自建筑的温和和实用的方法Ñ通过级联取代-2-恶唑酮,BF 3 ⋅Et 2 ø/ H 2涉及亚胺离子产生和由外部或内部烯属的和芳基部分捕获O形催化的反应进行说明。机理和计算研究表明,强质子酸HBF 4是这些级联反应的引发催化剂。这些过程提供了获得新颖分子多样性的途径,可以促进化学生物学研究,药物发现工作和天然产物合成。