The selective synthesis of sulfonate surfactants with side chains containing ether- and hydroxy groups was carried out using cyclic sulfates as epoxide analogues. The main chain was elaborated from 1,2-dodecane sulfate by the addition of various hydroxy/alkoxysulfonates. Ethyleneoxy- and 1,2-propyleneoxy- groups were introduced using ethylene sulfate and 1,2-propylene sulfate, respectively.
The ring-opening of cyclic sulfamidates and sulfates with α-fluorocarbanion generated from fluorobis(phenylsulfonyl)methane (FBSM) and subsequent reductive desulfonylation have been developed. This fluoromethylation approach allows access to γ- and δ-fluoroamines as well as γ- and δ-fluoroalcohols in high yields. The monofluoromethylation of cyclic sulfamidates with α-fluorocarbanion of ethyl 2-fluoroacetoacetate
A Convenient Method for the Synthesis of Alkenes from <i>Vic</i>-diols <i>via</i> Cyclic Sulfates with Magnesium Iodide
作者:Doo Ok Jang、Yung Hyup Joo
DOI:10.1080/00032719808006486
日期:1998.3.1
Reaction of cyclic sulfates of vic-diols with magnesium iodide in acetonitrile produced the corresponding olefins in excellent isolated yields at room temperature. Cyclic sulfates of trans-diols gave trans-alkenes exclusively. Cyclic sulfates of cis-diols gave a mixture of cis- and trans-alkenes. However, the cyclic sulfate of cyclic cis-diol afforded the corresponding cis-alkene only.
A Facile Route to Olefins from<i>Vic</i>-Diols<i>Via</i>Cyclic Sulfates with Triphenylphosphine and Iodine
作者:Doo Ok Jang、Yung Hyup Joo、Dae Hyan Cho
DOI:10.1080/00397919708004099
日期:1997.7
Treatment of cyclic sulfates of vic-diols with triphenylphosphine and iodine offers the corresponding olefins in high yields at room temperature. Both cyclic sulfates of d,l-hydrobenzoin and meso-hydrobenzoin give trans-stilbene.
Stereospecific conversion of chiral 1,2-cyclic sulfates to chiral imidazolines
作者:Ryu Oi、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)74471-6
日期:1991.2
The one pot preparation of imidazolines from 1,2-cyclic sulfates is reported. Amidines react with cyclic sulfates to give zwitterionic intermediates, and subsequent intramolecular cyclization affords imidazolines. The preparation of enantiopure stilbene diamine (stien) is achieved by the hydrolysis of its corresponding chiral imidazoline.