Reactions of ?-halo-?, ?-unsaturated aldehydes with secondary amines
作者:A. Yu. Raley、N. A. Keiko、M. G. Poronkov
DOI:10.1007/bf01433745
日期:1996.1
Reactions of 2-halo-2-alkenals R″(R′)C=CX-CHO with secondaryamines R2NH occur asipso-substitution of the halogen atom, along with fragmentation and condensation, yielding 1,2-diaminoethenes R2NCH=CHNR2, carbonyl compounds R″C(O)R′, 1,3-bis(amino)-2-haloolefins R″(R′)C(NR2)CX=CHNR2, and formamides R2NCHO. The ratio between the competing reactions depends on the structure of the starting compounds and
2-Sulfonylpyridine derivatives can be industrially produced efficiently by reacting a sulfonyl cyanide derivative with an &agr;,&bgr;-unsaturated carbonyl compound and a 2-{[(2-pyridyl)methyl]thio}-1H-benzimidazole skeleton can be formed in one step in a good yield by reacting this type of the 2-sulfonylpyridine derivative with a 2-methylthio-1H-benzimidazole derivative in the presence of an organolithium compound.
Über die synthese und eigenschaften einiger isomeren chlorhydroxyaldehyde
作者:Z. Jedlinski、J. Majnusz
DOI:10.1016/s0040-4020(01)82829-5
日期:1969.1
The paper describes the synthesis and properties of some isomeric chlorhydroxyaldehydes, obtained as the result of reactions between epoxyaldehydes and hydrogen chloride, or between unsaturated aldehydes and hypochlorous acid. The mechanisms of these syntheses are also suggested, as well as the course of the dimerisation of isomeric chlorhydroxyaldehydes.
We have developed a high-yielding and stereoselective vinylogousMukaiyamaaldolreaction (VMAR) of α-haloenals. Contrary to the simple α,β-unsaturated aldehyde, α-haloenals were found to be reactive affording the corresponding VMAR adducts in excellent yields. Some transformations of VMAR adducts by Pd-mediated cross-coupling were also examined in order to demonstrate the synthetic utility of VMAR