Propargyl Bromide as an Excellent α-Bromoacetone Equivalent: Convenient and New Route to α-Aroylacetones
摘要:
A variety of alpha-aroylacetones 4a-g have been prepared in excellent yields following a new protocol wherein alpha-aminonitriles la-g as the aryl acyl anion equivalents readily react with propargyl bromide as the alpha-bromoacetone equivalent. The alkylated product undergoes one-pot unmasking of the keto functionality along with Markovnikov's hydration of the terminal alkyne with CuSO(4)center dot 5H(2)O in aqueous methanol at 60 degrees C to furnish the desired target in excellent isolated yields.
The silver‐catalyzed oxidative C(sp3)−H/P−H cross‐coupling of 1,3‐dicarbonyl compounds with H‐phosphonates, followed by a chemo‐ and regioselective C(sp3)−C(CO) bond‐cleavage step, provided heavily functionalized β‐ketophosphonates. This novel method based on a readily available reaction system exhibits wide scope, high functional‐group tolerance, and exclusive selectivity.
A concise and efficient method for the synthesis of alkynyl/benzoyl-functionalized quinolines through TfOH-promoted cascade 1,4-conjugate addition/intramolecular annulation/aromatization process is established.
Synthetic and spectral investigations of fluorinated 4H-1,4-benzothiazines and their conversion into sulfones
作者:M.Y. Hamadi、Rajni Gupta、R.R. Gupta
DOI:10.1016/s0022-1139(98)00352-2
日期:1999.4
The synthesis of fluorinated 4H-1,4-benzothiazines and their conversion into sulfones is reported. The fluorinated 4H-1,4-benzothiazines were prepared by the condensation and oxidative cyclization of 2-amino-3-chloro-5-fluorobenzenethiol with compounds containing active methylene groups in DMSO. The reaction is believed to proceed via an enaminoketone system. Fluorinated 4H-1,4-benzothiazine sulfones
氟化的4 H -1,4-苯并噻嗪的合成及其转化为砜的报道。通过将2-氨基-3-氯-5-氟苯硫醇与含活性亚甲基的化合物在DMSO中进行缩合和氧化环化反应,制得氟化的4 H -1,4-苯并噻嗪。据信该反应通过烯氨基酮系统进行。氟化4 ħ -1,4-苯并噻嗪砜已经合成了由氟化4的氧化ħ通过在冰醋酸的30%过氧化氢-1,4-苯并噻嗪。包括IR,NMR和质谱研究。
Design, Synthesis, Herbicidal Activity, and Structure–Activity Relationship Study of Novel 6-(5-Aryl-Substituted-1-Pyrazolyl)-2-Picolinic Acid as Potential Herbicides
作者:Tong Feng、Qing Liu、Zhi-Yuan Xu、Hui-Ting Li、Wei Wei、Rong-Chuan Shi、Li Zhang、Yi-Ming Cao、Shang-Zhong Liu
DOI:10.3390/molecules28031431
日期:——
were designed and synthesized for the discovery of compounds with potent herbicidal activity. The compounds were tested for inhibitory activityagainst the growth of Arabidopsis thaliana roots, and the results demonstrated that the IC50 value of compound V-7 was 45 times lower than that of the halauxifen-methyl commercial herbicide. Molecular docking analyses revealed that compound V-7 docked with the
A mild approach to 1,4-diketones in moderate to excellent yields via 1,2-oxo alkylation has been developed using visible-light photocatalysis. The notable feature is the late-stage functionalization of thymol and ibuprofen derivatives.