The additions of chlorine, bromine and bromine chloride to trans methyl 2-butenoate 1, trans methyl 2-methyl-2-butenoate 2 and methyl 3-methyl-2-butenoate 3 under ionic conditions were studied. Bromine chloride addition always gave as a major regioisomer the 2-bromo-3--chloro compound,almost quantitatively in the case of 3. The mechanism of bromoniumion ring-opening (SN1 or SN2) is discussed with
氯,溴和氯化溴到加法反式甲基-2-丁烯酸乙酯1,反式甲基-2-甲基-2-丁烯酸甲酯2和3-甲基-2-丁烯酸乙酯3离子的条件下进行了研究。氯化溴加成总是得到为主要区域异构体的2-溴-3 -氯化合物,在几乎定量的情况下,3。关于双键取代和区域异构体的比例,讨论了溴离子开环(S N 1或S N 2)的机理。通过MS,1 H和13 C NMR鉴定出二卤代产物。
Domino Michael–O-alkylation reaction: one-pot synthesis of 2,4-diacylhydrofuran derivatives and its application to antitumor naphthofuran synthesis
The reaction of enolates of 1,3-dicarbonyl compounds with α-halo-α,β-unsaturated carbonyl compounds affords 2,4-diacyldihydrofuran derivatives in the presence of DBU in THF. Chemical manganese dioxide oxidation of the hydrofurans leads to 2,4-diacylfuran derivatives. Application of the protocol enables short-step syntheses of antitumor naphthofuran natural products.
Anionic [4+3] heteroannulation of 2-azidoacrylates: a modular synthesis of 2-benzazepin-1-ones
作者:Bidyut Kumar Dinda、Amit Kumar Jana、Dipakranjan Mal
DOI:10.1039/c2cc30279a
日期:——
2-Azidoacrylates undergo [4+3] annulation with phthalides under anionic conditions at low temperatures to furnish 5-hydroxy-2-benzazepinones, the formation of which represents a new concept for the construction of azepines as well as a new reactivity of 2-azidoacrylates.
Synthesis and biological evaluation of a series of benzoxazole/benzothiazole-containing 2,3-dihydrobenzo[b][1,4]dioxine derivatives as potential antidepressants
A series of benzoxazole/benzothiazole-2,3-dihydrobenzo[][1,4]dioxine derivatives (– and –) was synthesized. Compounds were evaluated for binding affinities at the 5-HT and 5-HT receptors. Antidepressant activities of the compounds were screened using the forced swimming test (FST) and the tail suspension test (TST). The results indicated that the compounds exhibited high affinities for the 5-HT and
Reaction of Vinyl Aziridines with Arynes: Synthesis of Benzazepines and Branched Allyl Fluorides
作者:Sherif J. Kaldas、Eva Kran、Christian Mück‐Lichtenfeld、Andrei K. Yudin、Armido Studer
DOI:10.1002/chem.201904727
日期:2020.2.3
on the reaction conditions and the choice of the aryne precursor, the aziridinium intermediate can be trapped through two distinct mechanistic pathways. The first one proceeds through a formal [5+2] cycloaddition to furnish valuable multi-substituted benzazepines. In the second pathway, the aziridinium is intercepted by a fluoride ion to afford allylic fluorides in good yields. Both reactions proceed