Efficient microwave induced direct α-halogenation of carbonyl compounds
作者:Jong Chan Lee、Jin Young Park、So Young Yoon、Yong Hun Bae、Seung Jun Lee
DOI:10.1016/j.tetlet.2003.10.133
日期:2004.1
A novel and direct method for the synthesis of α-halocarbonyl compounds using sequential treatment of carbonyl compounds with [hydroxy(tosyloxy)iodo]benzene followed by magnesium halides under solvent-free microwave irradiation conditions is described.
α,α-Alkylation-Halogenation and Dihalogenation of Sulfoxonium Ylides. A Direct Preparation of Geminal Difunctionalized Ketones
作者:Rafael D. C. Gallo、Anees Ahmad、Gustavo Metzker、Antonio C. B. Burtoloso
DOI:10.1002/chem.201704609
日期:2017.12.1
A one‐pot alkylation–halogenation of ketosulfoxonium ylides in the presence of alkyl halides is described. The method furnishes several gem‐difunctionalized haloketones (an alkyl and F, Cl, Br, or I) in good yields. Replacing alkyl halides with a mixture of electrophilic halogen species and various halide anions led to gem‐dihalogenated ketones containing a combination of the same or two different
Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes
作者:Zhong Zhang、Yuzheng Luo、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1039/c9sc00568d
日期:——
Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method
extensive but non-recyclable use of tetraalkoxydiboron(4) compounds as stoichiometric reagents in diverse reactions, this article reports an atom-economical reaction using a commercial diboron(4) as the catalyst. The key to success was designing a catalytic cycle for radical [3 + 2] cycloaddition involving a pyridine cocatalyst to generate from the diboron(4) catalyst and reversibly mediate the transfer of
Novel radioactive and non-radioactive iodobutyrophenone derivative and processes for the preparation thereof
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0213883A1
公开(公告)日:1987-03-11
A radioactive or non-radioactive 2-iodobutyrophenone derivative has the formula:
wherein X is a radioactive or non-radioactive iodine atom. The radioactive compound has a high affinity for dopamine receptors and is very useful as a radioactive diagnostic agent and as a radiopharmaceutical, and the nonradioactive compound also has a high affinity for dopamine receptors and is very useful as a neuroleptic, a sedative, an anodyne, a tranquilizer, etc.
放射性或非放射性 2-碘苯丁酮衍生物的化学式为
其中 X 是放射性或非放射性碘原子。放射性化合物对多巴胺受体有很高的亲和力,可用作放射性诊断剂和放射性药物,而非放射性化合物对多巴胺受体也有很高的亲和力,可用作神经抑制剂、镇静剂、安眠药、镇定剂等。