(4 + 3) cycloadditions of allenyl ether-derived oxygen-stabilized oxyallyls with furans

Literature Information

Publication Date 2019-12-09
DOI 10.1039/C9QO01349K
Impact Factor 5.281
Authors

Xian Huang, Waygen Thor, Xiangyu Feng, Liangliang Kang, Min Yang, Chi-Sing Lee, Yuen-Kit Cheng, Shuzhong He


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Abstract

(4 + 3) cycloadditions between allenyl ethers and furans are described. The reaction features an in situ formation of oxygen-stabilized oxyallyls via epoxidations of allenyl ethers in the presence of H2PO4−. The multiple interactions between the oxygen-stabilized oxyallyl species and H2PO4− were studied using DFT calculations for rationalization of the regio- and diastereoselectivity of this cycloaddition. The utilities of this cycloaddition have been demonstrated by converting the (4 + 3) cycloadduct into the cyclohepta[b]benzofuran skeleton of frondosin B in two steps.

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