A new process that could directly prepare α-haloacetal of ketones from various ketones with N-halosuccinimide (NBS/NCS) and ethylene glycol in one step without any other catalysts was reported. The effects of solvents, NBS/NCS and reaction temperature were investigated. Under the optimal condition, most of α-haloacetals of ketones were obtained in 90–100% yield.
One-pot synthesis of <font>α</font>-bromoacetals of ketones from secondary alcohols and 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) in ethylene glycol
作者:Bingbing Han、Zubiao Zheng、Fang Wu、Aidong Wang
DOI:10.1080/00397911.2017.1378681
日期:2017.12.17
of ketones were prepared from various secondary alcohols with 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) and ethylene glycol through oxidation, bromination, and acetalization in one pot without the use of other catalysts under mild conditions. The effects of DBDMH, the solvent, and N-bromosuccinimide on the reaction were investigated. Under the optimal conditions, most α-bromoacetals of ketones were
AMELIORANT OR REMEDY FOR SYMPTOMS CAUSED BY ISCHEMIC DISEASES AND COMPOUNDS USEFUL THEREFOR
申请人:SUNTORY LIMITED
公开号:EP0755923A1
公开(公告)日:1997-01-29
A medicine having the following basic structure, for the alleviation or treatment of symptoms derived from ischemic diseases and seizures, epilepsy, and migraine, having a powerful action in suppressing cytotoxic Ca2+ overload and free from side-effects:
wherein Z = C, CH, or N, X = O or CH2, E and Y = H, OH, a halogen, alkoxy, alkyl, or a halogen-substituted alkyl.
一种具有以下基本结构的药物,用于缓解或治疗缺血性疾病和癫痫发作、癫痫和偏头痛引起的症状,在抑制细胞毒性 Ca2+ 过载方面具有强大的作用,且无副作用:
其中 Z = C、CH 或 N,X = O 或 CH2,E 和 Y = H、OH、卤素、烷氧基、烷基或卤素取代的烷基。