A number of isopropyl-β-ketosulphinyl chlorides has been synthesised and their PMR spectra studied. Magnetic non-equivalence of the alpha gem-dimethyl groups is, in general, observed together with, in certain cases, magnetic non-equivalence of suitably positioned methylene and methine H atoms. This effect has been found to be temperature and solvent dependent and is probably due to both the intrinsic
H2O2/HCl system: Oxidation-chlorination of secondary alcohols to α,α′-dichloro ketones
作者:Gennady I. Nikishin、Nadezhda I. Kapustina、Lyubov' L. Sokova、Oleg V. Bityukov、Alexander O. Terent'ev
DOI:10.1016/j.tetlet.2020.152154
日期:2020.7
The one-pot oxidation-chlorination of secondary alcohols to give α,α′-dichloroketones in 62–80% yields is reported. The convenient and readily available H2O2/HCl system acts on secondary alcohols (C5-C17) with the formation of α,α′-dichloroketones. The reaction proceeds with high selectivity under the reported conditions; during this process peroxide formation and the Baeyer-Villiger oxidation reactions
据报导,通过一锅法氧化-仲醇氯化氯化得到α,α'-二氯酮,产率为62-80%。方便易用的H 2 O 2 / HCl系统作用于仲醇(C 5 -C 17),并形成α,α'-二氯酮。在报道的条件下,反应以高选择性进行。在此过程中,未观察到过氧化物的形成和Baeyer-Villiger氧化反应。
Novel 3-furyl beta oxoalkyl sulfides, processes for producing same and
申请人:International Flavors & Fragrances Inc.
公开号:US03985907A1
公开(公告)日:1976-10-12
3-Furyl beta-chalcogenalkyl sulfides having the structure: ##SPC1## Wherein n is 1 or 2; R.sub.2 and R.sub.3 are each selected from the group consisting of methyl and hydrogen, at least one of R.sub.2 and R.sub.3 being methyl; and R.sub.4 and R.sub.5 taken separately, are each lower alkyl, or R.sub.4 and R.sub.5 taken together complete a cycloalkyl or bicycloalkyl group, such 3-furyl beta-oxoalkyl sulfides taken alone or in admixture being useful in altering or modifying or enhancing the organoleptic properties of foodstuffs, and processes for preparing these 3-furyl beta-oxalkyl sulfides where n is 1 using the reaction: ##SPC2## Wherein X is halogen selected from the group consisting of chlorine and bromine; wherein M is alkali metal and R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each defined as above.
biocatalytic synthesis of chiral thiomorpholines using iminereductases (IREDs) is described. As substrates, four prochiral and one chiral 3,6-dihydro-2H-1,4-thiazines were synthesized in a modified Asinger reaction and subsequently reduced using iminereductases as a biocatalyst, NADPH as a cofactor, and a glucose dehydrogenase (GDH)-glucose cofactor regeneration system. As a result, chiral thiomorpholines