Catalytic [3+3] Annulation of
<scp>β‐Ketoethers</scp>
and Cyclopropenones
<i>via</i>
C(sp
<sup>3</sup>
)—O/C—C Bond Cleavage under
<scp>Transition‐Metal</scp>
Free Conditions
作者:Dachang Bai、Junyan Chen、Bingbing Zheng、Xueyan Li、Junbiao Chang
DOI:10.1002/cjoc.202100276
日期:2021.10
carbon-oxygen (C—O) bond is highly important for the transformation of oxygen-rich biomass and industry chemicals. Herein, an efficient [3+3] annulation of β-ketoethers with cyclopropenones in the presence of catalytic base has been developed, which proceeds through the C(sp3)—O bonds cleavage in β-ketoethers and C—C bond cleavage in cyclopropenones under transition-metal free conditions. The cleavage of C(sp3)—O
碳氧 (CO) 键的有效裂解对于富氧生物质和工业化学品的转化非常重要。在此,开发了一种在催化碱存在下 β-酮醚与环丙烯酮的有效 [3+3] 环化,其通过β-酮醚中的 C(sp 3 )-O 键断裂和 β-酮醚中的 C-C 键断裂进行。无过渡金属条件下的环丙烯酮。实现了烷基烷基醚和芳基烷基醚中C(sp 3 )-O键的断裂。该反应具有优异的官能团相容性和化学选择性,在温和的条件和简单的操作下以良好的收率获得了各种2-吡喃酮。