A simple and efficient palladium-catalyzed intramolecular carbonylativesynthesis of isocoumarins and phthalides from the easily available starting materials by employing phenylformate as a CO surrogate has been achieved. The approach affords target compounds in good to excellent yields with the advantages of lower toxicity, milder conditions, easy operation and wide functional group tolerance.
Synthesis of Benzo[<i>b</i>]furans via CuI-Catalyzed Ring Closure
作者:Cheng-yi Chen、Peter G. Dormer
DOI:10.1021/jo050788+
日期:2005.8.1
A wide variety of benzo[b]furans were synthesized efficiently via a CuI-catalyzed ringclosure of 2-haloaromatic ketones. The methodology was tolerant to various functional groups, affording benzofurans in 72−99% yields.
通过CuI催化的2-卤代芳族酮的闭环反应,可以高效合成各种苯并[ b ]呋喃。该方法可耐受各种官能团,可提供72-99%的产率的苯并呋喃。
Palladium-Catalyzed Synthesis of Isocoumarins and Phthalides via <i>tert</i>-Butyl Isocyanide Insertion
作者:Xiang-Dong Fei、Zhi-Yuan Ge、Ting Tang、Yong-Ming Zhu、Shun-Jun Ji
DOI:10.1021/jo302004u
日期:2012.11.16
efficient strategy for the synthesis of isocoumarins and phthalides through a palladium(0)-catalyzed reaction incorporating tert-butyl isocyanide has been developed. This process, providing one of the simplest methods for the synthesis of this class of valuable lactones, involves two steps including cyclization reaction and simple acid hydrolysis. The methodology is tolerant of a wide range of substrates
novel nickel catalyst for the reaction of tert-butyl isocyanide insertion was discovered. In this approach, 1,2-bis(diphenylphosphino)ethane (L3) serves as an efficient ligand, thereby allowing the preparation of lactones from (o-bromophenyl)phenylethanone derivatives. It is noteworthy that this is the first example of nickel acting as a metal catalyst in the reactions of tert-butyl isocyanide insertion
Iron and Copper Salts in the Synthesis of Benzo[b]furans
作者:Julien Bonnamour、María Piedrafita、Carsten Bolm
DOI:10.1002/adsc.201000269
日期:——
Intramolecular CO bond forming reactions of aryl 2‐bromobenzyl ketones lead to benzo[b]furans. The cyclizations can be catalyzed by 10 mol% of iron trichloride (of 98% or of 99.995% purity) or sub‐mol% quantities of copper(II) chloride (of 99.995% purity).
芳基2-溴苄基酮的分子内CO键形成反应导致苯并[ b ]呋喃。10 mol%的三氯化铁(纯度为98%或99.995%)或亚摩尔%的氯化铜(II)(纯度为99.995%)可以催化环化反应。