A Novel Synthesis of 3-Thietanols by Reactions of 2-(1-Haloalkyl)oxiranes with Monothiocarbamic Acid Salts
作者:Michinori Karikomi、Shin-ichi Narabu、Masaaki Yoshida、Takashi Toda
DOI:10.1246/cl.1992.1655
日期:1992.9
Several 3-thietanol derivatives were synthesized in good yields by stereospecific reactions of 2-(1-haloalkyl)oxiranes with monothiocarbamic acid salts.
Several 2-aminomethyloxiranes (2) have been synthesized in good yields by the reaction of 2-(1-bromoalkyl)oxiranes (1) with primary or secondary amines. cis-2-Aminomethyloxiranes (2) were obtained from syn-(2-bromomethyl)oxiranes (1) with amines and KOH, and trans-2-aminomethyloxiranes (2) were obtained from anti-(2-bromomethyl)oxiranes (1) with amines, respectively, with stereospecific manner.
Stereospecific isomerization of 3-substituted-3-bromo-1,2-epoxypropanes using magnesium bromide
作者:Michinori Karikomi、Takeshi Takayama、Kazuo Haga
DOI:10.1016/s0040-4039(02)00830-4
日期:2002.6
A novel stereospecific isomerization reaction of 3-substituted-3-bromo-1,2-epoxypropane derivatives into 1-substituted-3-bromo-1,2-epoxypropane derivatives is described. The choice of the solvent crucially influences the isomerization. The tendency of this isomerization could be predicted by comparison of the free energies calculation using ab initio and DFT methods. (C) 2002 Elsevier Science Ltd. All rights reserved.