描述了金催化的4-甲氧基-1,2-二烯基-5-炔基与蒽的[4 + 1]环。这些成环的机理涉及α-亚氨基金卡宾的腈形成,其经历1,2-丙二烯转变以形成(吡咯-2-基)甲基金中间体。在具有烯丙基酯底物的情况下,这些金中间体成为烯醇化物物种,从而使分子内的醛醇缩合反应能够形成有用的吡咯并[1,2- a ]喹啉衍生物。
Gold-Catalyzed [4 + 1]-Annulation Reactions between 1,4-Diyn-3-ols and Isoxazoles To Construct a Pyrrole Core
作者:Rahul Dadabhau Kardile、Balaji S. Kale、Pankaj Sharma、Rai-Shung Liu
DOI:10.1021/acs.orglett.8b01398
日期:2018.7.6
This work reports gold-catalyzed [4 + 1]-annulation reactions between 1,4-diyn-3-ols and isoxazoles or benzisoxazoles to yield pyrrole derivatives. The reaction chemoselectivity is controlled by an initial attack of an isoxazole at a less hindered alkyne to form gold carbenes, further inducing a 1,2-migration of a second alkyne group. A broad substrate scope of 1,4-diyn-3-ols, isoxazoles and even benzisoxazoles highlighted the reaction utility.
Patel,A.N., Journal of Organic Chemistry USSR (English Translation), 1977, vol. 13, p. 200 - 201
作者:Patel,A.N.
DOI:——
日期:——
FR2226383
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Jones et al., Journal of the Chemical Society, 1958, p. 1054,1057
作者:Jones et al.
DOI:——
日期:——
Patel,A.N., Journal of Organic Chemistry USSR (English Translation), 1977, vol. 13, p. 2075 - 2077