Sonogashira偶联,Pd(II)催化的羰基环化和苯并呋喃还原(Mg,MeOH,NH 4 Cl)的序列为反式-2-芳基-2,3-二氢苯并[ b ]呋喃提供了一种收敛的模块化合成途径。-3-羧酸盐,是许多具有生物活性的天然产物的结构特征。这种多用途的策略适用于抗HIV天然产物(+)-紫精酸的正式全合成。
Sonogashira偶联,Pd(II)催化的羰基环化和苯并呋喃还原(Mg,MeOH,NH 4 Cl)的序列为反式-2-芳基-2,3-二氢苯并[ b ]呋喃提供了一种收敛的模块化合成途径。-3-羧酸盐,是许多具有生物活性的天然产物的结构特征。这种多用途的策略适用于抗HIV天然产物(+)-紫精酸的正式全合成。
Construction of 2-Substituted-3-Functionalized Benzofurans via Intramolecular Heck Coupling: Application to Enantioselective Total Synthesis of Daphnodorin B
A novel approach was developed for the synthesis of 2-substituted-3-functionalized benzofurans, using an intramolecular Heckreaction which was further applied in the first enantioselectivetotalsynthesis of Daphnodorin B.
Iron-Catalyzed Tandem Oxidative Coupling and Annulation: An Efficient Approach to Construct Polysubstituted Benzofurans
作者:Xingwei Guo、Rong Yu、Haijun Li、Zhiping Li
DOI:10.1021/ja907568j
日期:2009.12.2
isotopic effect indicated that aromatic C-H bond cleavage is not involved in the rate-determining steps of the present transformation. Moreover, the results clearly demonstrate that the dichotomous catalytic behavior of the iron catalyst, which is transition-metal catalyst in the oxidative coupling step and Lewis acid in the condensation step. The possible intermediate 5 was synthesized and converted
A tandem oxidation/cyclization reaction of gamma-(arylmethyl)oxy-alpha-diazobutyrate derivatives was investigated. While oxidative cleavage of the PMB ether was only observed upon treatment of an alpha-diazo-beta-ketoester with DDQ, oxidation of alpha-diazo esters with an sp(3) carbon at the beta-position was accompanied by intramolecular attack of the diazo carbon atom and expulsion of the nitrogen gas to give 2,3-dihydrofurans in modest to good yields when an electron-withdrawing group was substituted at the beta-position. Substrates bearing no electron-withdrawing beta-substituent were found to give rearranged products, albeit in modest yields. A benzofuran derivative could also be obtained, although a hydroquinone adduct was formed as a byproduct.
Transition-Metal-Free Synthesis of 2-Substituted Methyl Benzo[<i>b</i>]furan-3-carboxylates
作者:Byungsoo Kang、Min Hyung Lee、Mijung Kim、Jungwoon Hwang、Hyeong Baik Kim、Dae Yoon Chi
DOI:10.1021/acs.joc.5b01311
日期:2015.8.21
A concise and highly efficient synthetic pathway was developed for 2-substituted methyl benzo[b]furan-3-carboxylates. This method provides convenient and cost-effective access for 2-substituted methyl benzo[b]furan-3-carboxylates without the use of a transition metal catalyst for synthesis. Furthermore, in most cases, this method gives excellent yields and conventional flash column chromatography is not needed for purification.
A Concise Route to Dihydrobenzo[<i>b</i>]furans: Formal Total Synthesis of (+)-Lithospermic Acid
作者:Joshua Fischer、G. Paul Savage、Mark J. Coster
DOI:10.1021/ol201130h
日期:2011.7.1
benzofuran reduction (Mg, MeOH, NH4Cl) provides a convergent and modular synthetic route to trans-2-aryl-2,3-dihydrobenzo[b]furan-3-carboxylates, which are a structural feature of numerous biologically active natural products. This versatile strategy was applied to the formal total synthesis of the anti-HIV natural product (+)-lithospermic acid.
Sonogashira偶联,Pd(II)催化的羰基环化和苯并呋喃还原(Mg,MeOH,NH 4 Cl)的序列为反式-2-芳基-2,3-二氢苯并[ b ]呋喃提供了一种收敛的模块化合成途径。-3-羧酸盐,是许多具有生物活性的天然产物的结构特征。这种多用途的策略适用于抗HIV天然产物(+)-紫精酸的正式全合成。