Copper and Rhodium Relay Catalysis for Selective Access to <i>cis</i>-2,3-Dihydroazepines
作者:You Li、Han Luo、Zongyuan Tang、Yingzi Li、Luan Du、Xiaolan Xin、Shanshan Li、Baosheng Li
DOI:10.1021/acs.orglett.1c02262
日期:2021.8.20
access synthetically challenging cis-2,3-dihydroazepines is reported. The reaction starts with readily available dienals, alkynes, and sulfonyl azides as the substrates and employs copper and rhodium as relay catalysts. Key steps include a copper-catalyzed reaction between an alkyne and a sulfonyl azide to form a triazole intermediate. The subsequent activation of this triazole intermediate by a rhodium
报告了一种新的催化协议,用于访问具有合成挑战性的顺式-2,3-二氢氮杂。该反应以容易获得的二烯醛、炔烃和磺酰叠氮化物作为底物开始,并使用铜和铑作为中继催化剂。关键步骤包括炔烃和磺酰叠氮化物之间的铜催化反应,以形成三唑中间体。随后用铑催化剂活化该三唑中间体,随后与二烯醛底物反应,最终产生二氢氮杂产物。产品的区域和立体化学被认为是通过立体定向旋转 8π-电环化过程来控制的,以对抗可能的竞争性 6π-电环化过程。