Synthesis of 2H-1-Benzopyrans by Pd-Catalyzed Cyclization of <i>o</i>-Allylic Phenols
作者:Richard C. Larock、Lulin Wei、Timothy R. Hightower
DOI:10.1055/s-1998-1709
日期:1998.5
Derivatives of 2H-1-benzopyran (1), also known as chromenes, are prominent natural products of many genera of the Asteraceae possessing a wide range of valuable physiological activities. They are also useful intermediates in the synthesis of complex natural products, such as pterocarpans.
Boronic acid/Brønsted acid co-catalyst systems for the synthesis of 2H-chromenes from phenols and α,β-unsaturated carbonyls
作者:Victoria Dimakos、Tishaan Singh、Mark S. Taylor
DOI:10.1039/c6ob01026a
日期:——
Protocols for the synthesis of substituted 2H-chromenes from α,β-unsaturated carbonyls and phenols are described. Optimal combinations of arylboronic acids and Brønsted acids have been identified, such that both can be employed in catalytic quantities to accelerate these condensations. The method has been used to synthesize a variety of substituted 2H-chromenes, as well as photochromic naphthopyrans
Synthesis of Diverse Indene Derivatives from 1-Diazonaphthalen-2(1<i>H</i>)-ones via Thermal Cascade Reactions
作者:Krishna Bahadur Somai Magar、Yong Rok Lee
DOI:10.1021/ol4019908
日期:2013.9.6
generates 1H-indene-3-carboxamides or 1H-indene-3-carboxylates. This constitutes an unprecedented three-component coupling reaction that allows for the synthesis of functionalized indenederivatives under catalyst-free thermal conditions.
1-重氮萘-2(1 H)-的连续Wolff重排,然后在存在各种醛的情况下用伯胺和芳族胺或醇和酚捕获烯酮中间体,生成1 H-茚3羧酰胺或1 H -茚-3-羧酸盐。这构成了前所未有的三组分偶联反应,可在无催化剂的热条件下合成官能化的茚衍生物。
ReCl(CO)5-catalyzed cyclocondensation of phenols with 2-methyl-3-butyn-2-ol to afford 2,2-dimethyl-2H-chromenes
作者:Hanxiang Zeng、Jia Ju、Ruimao Hua
DOI:10.1016/j.tetlet.2011.05.093
日期:2011.7
A direct one-pot route for the synthesis of 2,2-dimethyl-2H-chromenes by Re(CO)5Cl-catalyzed cyclocondensation of phenols with 2-methyl-3-butyn-2-ol has been developed. The easy availability of starting materials, mild reaction conditions, high atom-efficiency, and the use of a recoverable catalyst are advantages of this procedure.
A Novel Method for the Synthesis of Substituted Benzochromenes by Ethylenediamine Diacetate-Catalyzed Cyclizations of Naphthalenols toα,β-Unsaturated Aldehydes. Concise Synthesis of the Natural Products Lapachenole, Dihydrolapachenole, and Mollugin
作者:Yong Rok Lee、Yun Mi Kim
DOI:10.1002/hlca.200790247
日期:2007.12
benzochromenes was developed starting from naphthalenols and α,β-unsaturated aldehydes in the presence of ethylenediamine diacetate. This methodology was applied for the total synthesis of the biologically important natural products lapachenole, dihydrolapachenole, and mollugin with a benzochromene moiety.