Reaction of Corey Ylide with α,β-Unsaturated Ketones: Tuning of Chemoselectivity toward Dihydrofuran Synthesis
作者:Alexey O. Chagarovsky、Ekaterina M. Budynina、Olga A. Ivanova、Elena V. Villemson、Victor B. Rybakov、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/ol500877c
日期:2014.6.6
A straightforward, efficient, and reliable approach to synthetically valuable 2,3-dihydrofurans via a reaction between Corey ylide and α,β-unsaturated ketones has been developed. The use of simple and widely spread starting materials as well as mild reaction conditions and scalability provide a broad scope of 2,3-dihydrofurans.
A facile synthesis of trisubstituted alkenes from β-diketones and aldehydes with AlCl3 as catalyst
作者:Zheng-Nan Li、Xiao-Liang Chen、Yu-Jie Fu、Wei Wang、Meng Luo
DOI:10.1007/s11164-011-0322-y
日期:2012.1
Preparation of trisubstitutedalkenesfrom low-activity β-diketones and aldehydes with aluminum chloride as catalyst has been studied. The frequently used catalyst AlCl3 is used for the first time to promote this condensation. The procedure is a convenient, low toxicity, and highly efficient method for industrial synthesis of trisubstitutedalkenes in high yield.
Design and Synthesis of 4-Alkyl-2-amino(acetamino)-6-aryl-1,3-thiazine Derivatives as Influenza Neuraminidase Inhibitors
作者:Wan Li、Lin Xia、Aixi Hu、Ailin Liu、Junmei Peng、Weiqing Tan
DOI:10.1002/ardp.201300122
日期:2013.9
With a convenient and economical method, two series of 1,3‐thiazine derivatives 1 and 2 were synthesized, and their neuraminidase (NA) inhibitory activities were evaluated. The pharmacological results showed that most of the compounds have potent NA inhibitory activity. Especially, 1g exhibited the best activity against influenza virus A (H1N1) NA (IC50 = 29.06 µg/mL), and its crystal structure was
A new In–SiO2 composite catalyst in the solvent-free multicomponent synthesis of Ca2+ channel blockers nifedipine and nemadipine B
作者:Ricardo F. Affeldt、Edilson V. Benvenutti、Dennis Russowsky
DOI:10.1039/c2nj40060j
日期:——
An InâSiO2 composite was prepared by the solâgel method and was applied as a heterogeneous Lewis acid catalyst in the multicomponent Hantzsch synthesis of symmetrical and non-symmetrical 1,4-DHPs. The Ca2+ channel blockers nifedipine and nemadipine B were synthesized in a single step through a solvent-free protocol.
Knoevenagel-kondensationen mit titantetrachlorid/base—II
作者:W. Lehnert
DOI:10.1016/0040-4020(72)84029-8
日期:1972.1
the presence of titaniumtetrachloride in tetrahydrofurane and a tert. organic base. ethyl acetoacetate and ethyl nitroacetate undergo condensation with aliphatic, aromatic, and heterocyclic aldehydes to give the corresponding α,β-unsaturated α-acetyl and α-nitro carboxylic acidesters in good yields. The latter compounds are of interest in the preparation of various α-amino acids.