Fischer Carbene Catalysis of Alkynol Cycloisomerization: Application to the Synthesis of the Altromycin B Disaccharide
作者:BonSuk Koo、Frank E. McDonald
DOI:10.1021/ol070435s
日期:2007.4.1
[reaction: see text] The tungsten-catalyzed cycloisomerization of alkynyl alcohols can be conducted without using photochemistry, using a stable tungsten Fischer carbene as the precatalyst for this transformation. A variety of alkynyl alcohols undergo cycloisomerization under these conditions to provide endocyclic enol ethers of five-, six-, and seven-membered ring sizes. The utility of this method is further
[反应:见正文]使用稳定的费休钨卡宾烯作为该转化的预催化剂,可以在不使用光化学的情况下进行炔醇的钨催化的环异构化。在这些条件下,各种炔醇经历环异构化,以提供五元,六元和七元环大小的环内烯醇醚。该方法的实用性在阿霉素B的二糖亚结构的立体选择性合成中得到了进一步证明。