Reaction of Corey Ylide with α,β-Unsaturated Ketones: Tuning of Chemoselectivity toward Dihydrofuran Synthesis
作者:Alexey O. Chagarovsky、Ekaterina M. Budynina、Olga A. Ivanova、Elena V. Villemson、Victor B. Rybakov、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/ol500877c
日期:2014.6.6
A straightforward, efficient, and reliable approach to synthetically valuable 2,3-dihydrofurans via a reaction between Corey ylide and α,β-unsaturated ketones has been developed. The use of simple and widely spread starting materials as well as mild reaction conditions and scalability provide a broad scope of 2,3-dihydrofurans.
An Expedient Approach to the Benzopyran Core: Application to Synthesis of the Natural Products (±)-Xyloketals and (±)-Alboatrin
作者:Zhongliang Xu、Yiying Li、Bingtai Lu、Jiyan Pang、Yongcheng Lin
DOI:10.1002/cjoc.201190018
日期:2010.12
A mild and efficient protocol for the synthesis of the benzopyran ring has been described and a series of chromans compounds is reported, the yield is from 72% to 95%. The diadduct tended to angular product and showed good regioselectivity. This strategy was applied for the benzopyran derived naturalproducts (±)‐xyloketals and (±)‐alboatrin. The crystal of compound 9 exhibited centro‐symmetric space
Design and Synthesis of Novel Xyloketal Derivatives and Their Vasorelaxing Activities in Rat Thoracic Aorta and Angiogenic Activities in Zebrafish Angiogenesis Screen
A novel series of xyloketal derivatives (1-21) were designed and prepared. The majority of the compounds demonstrated vasorelaxation action on 60 mM KCl-induced contractions rat isolated aortic rings in a concentration-dependent manner, and the action is mediated by both endothelium-independent and endothelium-dependent mechanisms. Compounds 9, 12, 13, 14, 15, and 19 showed higher vasorelaxation activities comparing with the lead compound 3. In addition, these derivatives had potential protective action against oxLDL-induced endothelial oxidative injury and enhanced NO production in HUVECs without toxic effects. The NO release was completely inhibited by eNOS inhibitor L-NAME. Furthermore, 3 significantly promoted the angiogenesis in zebrafish in a concentration-dependent manner at 0.1, 1, and 10 mu M. Compounds 9, 12, 14, 16, 20, and 21 exhibited stronger angiogenic activities than 3. Therefore, xyloketal derivatives are unique compounds with multiple pharmacological properties and may have potential implications in the treatment of cardiovascular diseases.