Trihaloisocyanuric Acid/Triphenylphosphine: An Efficient System for Regioselective Conversion of Epoxides into Vicinal Halohydrins and Vicinal Dihalides under Mild Conditions
作者:Marcio de Mattos、Vitor de Andrade
DOI:10.1055/s-0035-1560408
日期:——
vicinal chloro-/bromohydrins and vicinal dihalides by reaction with the system trihaloisocyanuric acid/triphenylphosphine in acetonitrile under mild and neutral conditions. The reactions proceed smoothly in high yield at room temperature and at reflux, respectively, over a short time. A new synthetic method has been developed for the regioselective conversion of epoxides to vicinal chloro-/bromohydrins
One-Pot Synthesis of N-Substituted Alkylaminocyclohexanols by the Addition of Electrophiles Formed in situ in the System Н2О2 + HBr (HCl)
作者:O. A. Sadygov、Kh. M. Alimardanov、Sh. I. Ismailova、N. R. Babaev
DOI:10.1134/s1070363218040072
日期:2018.4
Highly selective one-pot synthesis of N-substituted aminocyclohexanols has been performed by hydroxyhalogenation of the corresponding cyclohexenes with electrophilic reagents formed in situ in the system Н2О2 + HHlg (Hlg = Cl, Br), with subsequent substitution of halogen atoms with amines. Some products were tested as antimicrobial additives to motor oils and cooling lubricants and showed high antibacterial
N-取代aminocyclohexanols的高度选择性一锅合成已经通过与就地形成的在系统Н亲电试剂相应的环己烯的hydroxyhalogenation进行2 О 2 + HHlg(HLG =氯,溴),具有卤原子的后续取代胺类。对某些产品进行了测试,用作机油和冷却润滑剂的抗菌添加剂,并显示出很高的抗菌和抗真菌活性。
Facile Conversion of Epoxides to Chlorohydrins with Titanium(IV) Chloride/ 1,8-Diazabicyclo[5.4.0]undec-7-ene
作者:Carol-Lynn Spawn、Gary J. Drtina、David F. Wiemer
DOI:10.1055/s-1986-31596
日期:——
A series of epoxides has been converted to the analogous chlorohydrins by treatment with titanium(IV) chloride and 1,8-diazabicyclo[5.4.0-undec-7-ene. This procedure tolerates acetal protecting groups normally labile to aqueous acids, and, when used in conjunction with the Sharpless epoxidation protocols, it allows the preparation of chiral chlorodiols selectively protected at one hydroxy group.