72093-12-0Relevant academic research and scientific papers
Quinocidin, acytotoxic antibiotic with anunusual 3,4-dihydroquinolizinium ring and michael acceptor reactivity toward thiols
Nakagawa, Yu,Sawaki, Yuki,Kimura, Takahiro,Tomura, Tomohiko,Igarashi, Yasuhiro,Ojika, Makoto
supporting information, p. 17894 - 17897 (2019/03/07)
Cytotoxicity-guided fractionation of the culture broth of Actinomadura sp. TP-A0019 led to the isolation of quinocidin (1), acytotoxic antibiotic with an unusual 3,4-dihydroquinolizinium ring. The structural assignment was made on the basis of high-field NMR experiments and chemical synthesis. Comparison ofthe spectral properties of 1 with those of its synthetic counterparts revealed that 1 is aracemic mixture of two enantiomers, which showed similar cytotoxicity against HeLa-S3 cells. Nucleophile-trap-ping experiments demonstrated that 1 captured 2-mer-captoethanol and N-acetyl-l-cysteine by means of aMi-chael addition-type reaction, but was inert toward 2-ami-noethanol and glycolic acid. Notably, the addition of 1 to thiols proceeded smoothly in neutral aqueous media at room temperature. In view of the thiol-trapping ability and the unusual structure, 1 provides aunique scaffold for designing drug leads and protein-labeling probes.
Ring selective lithiation of 3,5-lutidine. A new route to heterocyclic building blocks
Gros, Philippe,Viney, Cédric,Fort, Yves
, p. 628 - 630 (2007/10/03)
The first direct ring lithiation of 3,5-lutidine has been performed by the BuLi-LiDMAE reagent. Successful sequential metallations and electrophilic condensations have been performed giving access to new useful polysubstituted pyridines.
2,2,4,4-tetrasubstituted 4-formylbutyronitrile intermediates for the production of trisubstituted pyridines
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, (2008/06/13)
2,2,4,4-Tetrasubstituted-4-formylbutyronitriles are intermediates for the preparation of the known 2-chloro-3,5-dimethylpyridine and 2,5-dichloro-3-methylpyridine which in turn are suitable for the production of different compounds, in particular insecticides and herbicides.
Process for the production of chloropyridines substituted by methyl, trichloromethyl or trifluoromethyl groups
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, (2008/06/13)
Chloropyridines of the formula STR1 wherein either R is chlorine and R' is methyl or trifluoromethyl, or R is methyl, trichloromethyl or trifluoromethyl and R' is chlorine, or R and R' are methyl, can be obtained by a novel, simple process by the addition of trichloroacetaldehyde to methacrylonitrile or α-trifluoromethacrylonitrile, 2,2-dichloropropionaldehyde, pentachloropropionaldehyde or 2,2-dichloro-3,3,3-trifluoropropionaldehyde to acrylonitrile, or 2,2-dichloropropionaldehyde to methacrylonitrile, in the presence of a catalyst, in particular copper powder or copper(I) chloride, and cyclizing the open-chain intermediate obtained. The chloropyridines of the formula (I) are known per se and are suitable for the production of different compounds, in particular of insecticides and herbicides.
