Mild, Efficient, and Greener Dethioacetalization Protocol Using 30% Hydrogen Peroxide in Catalytic Combination with Ammonium Iodide
作者:Nemai C. Ganguly、Pallab Mondal
DOI:10.1080/00397911.2010.502995
日期:2011.8.15
Abstract A simple, mild, efficient, and expedient greener dethioacetalization protocol employing a catalytic amount of nontoxic ammonium iodide (10 mol%) in combination with 30% hydrogen peroxide as terminal oxidizer is revealed. The reagent accomplished facile deprotection of 1,3-dithianes and dithiolanes of activated aromatic substrates in an aqueous medium in the presence of sodium dodecylsulfate
摘要揭示了一种简单、温和、高效且方便的绿色脱硫缩醛化方案,该方案采用催化量的无毒碘化铵 (10 mol%) 和 30% 过氧化氢作为末端氧化剂。在十二烷基硫酸钠 (SDS) 的存在下,在室温下,在几乎中性的条件下,该试剂在水性介质中实现了 1,3-二噻烷和活化芳香底物的二硫戊环的轻松脱保护。失活和空间阻碍的底物,否则在水性胶束条件下不愿意切割,在乙酸中以良好到极好的产率迅速切割。该方法具有耐受性,具有多种酸敏感保护基团,例如叔丁基二苯基甲硅烷基 (TBDPS) 醚、乙酸芳基酯、NHBoc 和 NHBn,并进一步氧化易氧化的活化苯甲醛和呋喃醛。提出了次碘酸介导的催化裂解的初步机制。