Expedient Acylations of Primary and Secondary Alkyl Cyanides to α-Substituted β-Ketonitriles
摘要:
Primary and secondary cyanides are efficiently acylated with N-acylbenzotriazoles 3a-f (derived from a variety of acids) to afford the corresponding alpha-substituted beta-ketonitriles 5a-r in 67-96% yields.
α-Nitro Ketone Synthesis Using <i>N</i>-Acylbenzotriazoles
作者:Alan R. Katritzky、Ashraf A. A. Abdel-Fattah、Anna V. Gromova、Rachel Witek、Peter J. Steel
DOI:10.1021/jo051231x
日期:2005.11.1
Readily available N-acylbenzotriazoles 2a−l (derived from a variety of aliphatic, (hetero)aromatic, and N-protected α-amino carboxylic acids) smoothly convert primary 3a−c and α-functionalized primary nitroalkanes 3d into the corresponding α-nitro ketones 5a−p in yields of 39−86% (average 63%).
An efficient one-pot synthesis of N,N′-disubstituted ureas and carbamates from N-acylbenzotriazoles
作者:Anoop S. Singh、Dhananjay Kumar、Nidhi Mishra、Vinod K. Tiwari
DOI:10.1039/c6ra14131e
日期:——
A facile and high-yielding one-pot synthesis of carbamates and N,N'-disubstituted symmetrical ureas from N-acylbenzotriazoles has been devised. It is believed that, the intermediate acyl-azide undergo Curtius rearrangement and under different...
Synthesis and Structure−Activity Relationship Studies of Cytotoxic Ester and Ether Anhydrovinblastine Derivatives
作者:Han-Kun Zhang、Yong Shao、Hong Ding、Li-Hong Hu
DOI:10.1021/np800284h
日期:2008.10.24
activities against human non-small-cell lung cancer (A549) and cervical epithelial adenocarcinoma (HeLa) cell lines. Ester anhydrovinblastine derivatives exhibited potent cytotoxicity, whereas the ether analogues were much less active. The size of the introduced substituents was the foremost factor in determining the resultant cytotoxic activity. Compound 12b showed a similar cytotoxic potency to the
phenylation reactions of α-acylnitromethanes catalyzed by trifluoromethanesulfonic acid have been studied. α-Aroylnitromethanes afforded benzil monooximes in good yield. In the case of aliphatic α-acylnitromethane, a similar phenylation reaction proceeded, but the yield of the phenylated 1,2-dione monooxime was low. These phenylation reactions represent examples of the generation of carbocation electrophiles
1,2- vs 1,4-Addition of Acylbenzotriazoles to α,β-Unsaturated Aldehydes and Ketones. A Novel Route to 3-Alkyl-4,6-diaryl-3,4-dihydropyran-2-ones
作者:Alan R. Katritzky、Olga V. Denisko
DOI:10.1021/jo011082s
日期:2002.5.1
Lithiation of aliphatic 1-acylbenzotriazoles with subsequent reaction with alpha,beta-unsaturated ketones and aldehydes affords either 3,4,6-trisubstituted 3,4-dihydropyran-2-ones or 1,3-dienes depending on the carbonyl reagent used. Substituent effects on product yield and isomer ratio are discussed.