New Efficient Synthesis of 1,4-Benzodiazepin-5-ones by Catalytic Aza-Wittig Reaction
摘要:
1,4-Benzodiazepin-5-ones were synthesized in 71-89% yields from 2-isocyanato-N-(2-oxoalkyl)benzamides via a new catalytic intramolecular aza-Wittig reaction. Starting from easily accessible phthalic anhydride and alpha-arylamino ketones, the corresponding 2-{[(2-oxoalkyl) amino] carbonyl} benzoic acids underwent sequential formation of the acid azide and Curtis rearrangement to give 2-isocyanato-N-(2-oxoalkyl) benzamides that were reacted directly to give the final 2,4-diaryl-3,4-dihydro-5H-1,4-benzodiazepin-5-ones and 4-aryl-2-tert-butyl- 3,4-dihydro-5H-1,4-benzodiazepin-5-ones.
A direct method for the synthesis of 1,3,4-triarylpyrroles was achieved easily from cyclization of α-amino carbonylcompounds and aldehydes catalyzed by I2. Various substituted groups can be employed, and this reaction can proceed smoothly in moderate to good yields.
Zinc Iodide Catalyzed Synthesis of 3-Aminoimidazo[1,2-a]pyridines from 2-Aminopyridines and α-Amino Carbonyl Compounds
作者:Guosheng Huang、Xu Han、Chaowei Ma、Zhaoyang Wu
DOI:10.1055/s-0035-1560375
日期:——
concise approach to 3-aminoimidazo[1,2-a]pyridines is developed via the zinc iodide catalyzed reaction of 2-aminopyridines and α-amino carbonyl compounds in the presence of oxygen. This novel and user-friendly protocol employing diverse and easily available substrates affords the desired products in good to excellent yields. A concise approach to 3-aminoimidazo[1,2-a]pyridines is developed via the
摘要 通过在氧存在下2-氨基吡啶和α-氨基羰基化合物的碘化锌催化反应,开发了一种简单的3-氨基咪唑并[1,2- a ]吡啶的方法。这种新颖且用户友好的方案采用了多种多样且易于获得的底物,从而以良好至极佳的产量提供了所需的产品。 通过在氧存在下2-氨基吡啶和α-氨基羰基化合物的碘化锌催化反应,开发了一种简单的3-氨基咪唑并[1,2- a ]吡啶的方法。这种新颖且用户友好的方案采用了多种多样且易于获得的底物,从而以良好至极佳的产量提供了所需的产品。
Synthesis of substituted 1,3-diaryl-6,7-dihydro-1H-indol-4(5H)-ones from 1-aryl-2-arylaminoethanones
A simple and novel method for the synthesis of 1,3-diaryl-6,7-dihydro-1H-indol-4(5H)-ones from 1-aryl-2-arylaminoethanones and substituted cyclohexane-1,3-diones through acetic acid mediated reaction is disclosed.
for the simple copper‐catalyzedα‐amination of α‐aminocarbonyl compounds to afford 2‐amino‐2‐iminocarbonyl and 2‐amino‐2‐oxocarbonyl compounds is reported. This transformation is achieved by C(sp3)−H and N−H bond oxidative cross‐coupling and selective C−N bond oxidative cleavage. This reaction system has a broad reaction scope, providing a facile pathway for the α‐functionalization of α‐amino ketones
Herein, we report an efficient strategy for the rapid construction of 1,4-oxazines starting from simple α-amino ketones and diazo pyruvates under mild reaction conditions. This transformation is efficiently catalyzed by RuCl3 through a tandem N–H insertion/cyclization sequence via an enol formation. This reaction shows broad functional group tolerance, and the resulting 1,4-oxazine products show promising