Combined Rhodium-Catalyzed Carbon-Hydrogen Activation and β-Carbon Elimination to access Eight-Membered Rings
作者:Damien Crépin、James Dawick、Christophe Aïssa
DOI:10.1002/anie.200904527
日期:2010.1.12
Enlarge! CH bond activation and β‐carbon elimination are combined in a net intramolecular hydroacylation of alkylidenecyclobutanes and alkylideneazetidines in the presence of rhodium catalysts, affording eight‐membered‐ring compounds in high yield (see scheme). This study demonstrates the possibility of exploiting the strain energy of azetidines through β‐carbon elimination in new transition‐metal‐catalyzed
One-pot preparation of Julia-Kocienski sulfides and sulfones from alcohols
作者:Kaori Ando、Junichiro Hattori
DOI:10.1016/j.tetlet.2019.151017
日期:2019.9
method for one-potpreparation of Julia-Kocienski sulfides and sulfones from alcohols and thiols is reported. A variety of primary alcohols were converted to the corresponding mesylates by methansulfonyl chloride and triethylamine in THF. After the reaction is complete, thiol (1 or 10) and either NaH or t-BuOK were added. The Julia-Kocienski sulfides 3, 9 and 11 were prepared by one-pot two steps procedure
报道了一种从醇和硫醇单锅制备Julia-Kocienski硫化物和砜的方法。甲磺酸磺酰氯和三乙胺在THF中将各种伯醇转化为相应的甲磺酸酯。反应完成后,加入硫醇(1或10)和NaH或t- BuOK。茱莉亚-Kocienski所硫化物3,9和11分别通过一釜两步过程在76-96%的产率(16个实施例)制备由醇。此外,在硫化物形成后,将反应混合物用对甲苯磺酸中和并用H 2 O 2处理。和在EtOH中的钼酸铵,除反式-2-hexen-1-ol外,均以良好的收率得到Julia-Kocienski砜4。