A New Synthetic Route to 2-Dialkylamino-2-alkenals
作者:N. A. Keiko、A. Yu. Rulev、I. D. Kalikhman、M. G. Voronkov
DOI:10.1055/s-1989-27282
日期:——
2-Dialkylamino-2-alkenals are easily prepared by reaction of 2-halo-2-alkenals with secondary aliphatic amines.
2-二烷基氨基-2-烯醛可以通过2-卤代-2-烯醛与二级脂肪胺反应而容易制备。
Method for producing 2-sulfonylpyridine derivatives and method for producing 2-{[(2-pyridyl)methyl]thio}-1H-benzimidazole derivatives
申请人:Kuraray Co., Ltd.
公开号:US06197962B1
公开(公告)日:2001-03-06
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.
Alkoxychlorofluorocyclopropanes are easily prepared by chlorofluorocarbene addition to en-ethers in a two-phase system and converted by simple heating in an aqueous solvent mixture to 2-fluoro-2-alkenals which can be reduced to the corresponding alcohols.
Syntheses of a Pair of Simplified Model Compounds of the Dihydroxycyclopentenone Core of the Kodaistatins A-D
作者:David Peter、Reinhard Brückner
DOI:10.1002/ejoc.201801117
日期:2018.12.6
synthesized. NMR analogies show that kodaistatin A must be trans‐configured. A key‐step was a syn‐selective aldol addition. An oxidation/reduction tandem furnished the β‐epimeric anti‐aldol. Each aldol was processed to a 5‐brominated 1,4‐diketone. The latter cyclized by an SmI2‐mediated aldol addition. Ensuing dehydrations delivered the cyclopentenone motive.
A New Approach to Models of the 4,5-Dihydroxycyclopentenone Core of the Kodaistatins A-D: Elucidation of the Diol Configuration in Kodaistatin A
作者:David Peter、Reinhard Brückner
DOI:10.1002/chem.201701185
日期:2017.9.7
the four possible stereostructures. We conclude that kodaistatin A is a trans‐, not a cis‐diol from NMR comparisons with a pair of cis, trans‐isomeric kodaistatin models, which we synthesized in 11 and 12 steps, respectively. The stereocenters of the diol moiety arose from stereocomplementary, highly diastereoselective aldol additions of a lithium enolate or the corresponding silyl ketene acetal. The