化学性质:E型熔点为75-76℃,Z型熔点为101-103℃。
用途:作为氯苯唑青霉素钠的中间体。
生产方法:通过使用邻氯苯甲醛并以盐酸羟胺肟化制得。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (Z)-2-chloro-N-hydroxybenzimidoyl chloride | 29568-74-9 | C7H5Cl2NO | 190.029 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-chlorobenzaldoxime | 3717-27-9 | C7H6ClNO | 155.584 |
—— | (E)-2-chlorobenzaldehyde O-methyl oxime | 70242-25-0 | C8H8ClNO | 169.611 |
—— | 2-[(E)-(2-chlorophenyl)methylideneamino]oxyacetic acid | 63564-19-2 | C9H8ClNO3 | 213.62 |
—— | 2-Chloro-benzaldehyde O-(2-diethylamino-ethyl)-oxime | 61819-84-9 | C13H19ClN2O | 254.76 |
—— | 2-chloro-N-hydroxybenzimidoyl chloride | 29568-74-9 | C7H5Cl2NO | 190.029 |
—— | (Z)-2-chloro-N-hydroxybenzimidoyl chloride | 29568-74-9 | C7H5Cl2NO | 190.029 |
A highly stereoselective synthesis of E-isomer of aldoximes was developed through a base-catalysed domino aza-Michael/retro-Michael reaction of hydroxylamine and 2-(R-benzylidene)malononitrile. This reaction generates (E)-aldoxime diastereomer in high yields (eight examples, isolated yields of 82-93 %), excellent diastereomeric purity (diastereomeric ratio higher than 95: 5 by 1H NMR), and proceeds under mild reaction conditions (aqueous NaOH, pH 12, room temperature, 4 h).
The KOH-, K2CO3-, or Et3N-catalyzed ring-opening reaction of N-tosylaziridines using the nitrogen atom of a series of (E)-aldoximes and (E)-ketoximes as a nucleophilic atom instead of an oxygen atom was developed to construct various nitrones under mild reaction conditions. Diverse (E)-aldoximes and (E)-ketoximes were demonstrated to be compatible with this reaction and the products of O-ring-opening reactions were not detected for most examples.