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.
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
Palladium-catalyzed chemoselective synthesis of indane-1,3-dione derivatives via tert-butyl isocyanide insertion
作者:Huaqing Duan、Zhong Chen、Li Han、Yulin Feng、Yongming Zhu、Shilin Yang
DOI:10.1039/c5ob00472a
日期:——
A simple and efficient strategy for the synthesis of indane-1,3-dione derivatives through a palladium(0)-catalyzed reaction incorporating tert-butyl isocyanide has been developed.
Isoflavone derivatives were synthesized viaintramolecularcyclization of 3‐(2‐bromophenyl)‐3‐oxopropanal derivatives, using CuI as the catalyst, 2‐picolinic acid (=pyridine‐2‐carboxylic acid) as the ligand, K2CO3 as the base, and DMF as the solvent, in up to 96% yield. The synthesis is functional group‐tolerant.
异黄酮衍生物是通过以CuI为催化剂,以2-吡啶甲酸(=吡啶-2-羧酸)为配体,以K 2 CO 3为催化剂,通过3-(2-溴苯基)-3-氧丙醛衍生物的分子内环化反应合成的。碱和DMF作为溶剂,产率高达96%。合成是官能团耐受的。
Metal-Free Intramolecular Amination: One-Pot Tandem Synthesis of 3-Substituted 4-Quinolones
3-Substituted 4-quinolones were synthesized using a one-pot metal-free strategy in moderate to quantitative yields. Carried out in dimethylsulfoxide (DMSO) via a sequential addition of materials, the methodology is tolerant of a wide range of functional groups and applicable to library synthesis.