Gold(I)-catalyzed cascade cyclization reaction: highly regio- and diastereoselective intermolecular addition of water and alcohols to epoxy alkynes. 2007

Lun-Zhi Dai, and Ming-Juan Qi, and Yong-Ling Shi, and Xu-Guang Liu, and Min Shi
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai, China 200032.

We have developed a novel access to ketal skeletons through a highly regio- and diastereoselective intermolecular addition of water and alcohols to alkynyl epoxides catalyzed by gold(I). This procedure involves a domino three-membered ring-opening, 6-exo-cycloisomerization, and subsequent intra- or intermolecular nucleophilic addition to a double-bond sequence.

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