Trichloroisocyanuric Acid, as an Industrial Chemical, Promotes Transthioacetalization of Diacetals of 2,2-Bis (Hydroxymethyl)-1,3-propanediol and Cleavage of Thioacetals
Trichloroisocyanuric acid has been used as a mild, efficient, and new catalyst for transthioacetalization of diacetals of 2,2-bis (hydroxymethyl)-1,3-propanediol in CH 2 Cl 2 at room temperature. A clean, easy, and general method for efficientdeprotection of thioacetals to their corresponding carbonyl compounds using trichloroisocyanuric acid/silica gel and water system also is described.
Oxalic Acid-promoted Preparation of Dithioacetals from Carbonyl Compounds or Acetals
作者:Hideyoshi Miyake、Yuichi Nakao、Mitsuru Sasaki
DOI:10.1246/cl.2007.104
日期:2007.1
This letter describes oxalic acid-promoted syntheses of dithioacetals from carbonyl compounds and thiols. Acetals are also converted into dithioacetals by the reaction with thiols under similar con...
SBA-15 functionalized sulfonic acid containing a confined hydrophobic and acidic ionic liquid: a highly efficient catalyst for solvent-free thioacetalization of carbonyl compounds at room temperature
作者:Babak Karimi、Majid Vafaeezadeh
DOI:10.1039/c3ra42286k
日期:——
SBA-15 functionalized sulfonic acid containing a confined ionic liquid has been introduced to convert various carbonylcompounds to their corresponding dithioacetals and dithioketals at room temperature and under solvent-free conditions. It was found that coating SBA-15-Pr-SO3H with the hydrophobic and acidic ionic liquid [OMIm]HSO4 at a loading of 0.8 mL g−1 of silica, afforded paths for faster mass transfer
引入了一种含有受限离子液体的SBA-15官能化磺酸的新应用,可在室温和无溶剂条件下将各种羰基化合物转化为其相应的二硫缩醛和二硫缩酮。发现以0.8 mL g -1的二氧化硅负载疏水性和酸性离子液体[OMIm] HSO 4涂覆SBA-15-Pr-SO 3 H ,提供了将原料更快地质量转移到SBA-15-Pr-SO 3 H中的途径。活动站点。同时,由于酸性位点的协同作用机理,它也可能增加布朗斯台德酸的强度。催化剂可以很容易地回收和再利用至少八个反应循环,而其催化活性只有轻微的损失。
Mild Deprotection of Dithioacetals by TMSCl/NaI Association in CH
<sub>3</sub>
CN
A mild process using a combination of TMSCl and NaI in acetonitrile is used to regenerate carbonyl compounds from a variety of dithiane and dithiolane derivatives. This easy to handle and inexpensive protocol is also efficient to deprotect oxygenated and mixed acetals as 1,3-dioxanes, 1,3-dioxolanes and 1,3-oxathianes quantitatively. As a possible extension of this method, it was also showed that
在乙腈中使用 TMSCl 和 NaI 组合的温和工艺用于从各种二噻烷和二硫戊环衍生物中再生羰基化合物。这种易于操作且价格低廉的方案还可以有效地将含氧和混合缩醛作为 1,3-二氧六环、1,3-二氧戊环和 1,3-氧杂环己烷进行定量脱保护。作为该方法的可能扩展,还表明作为腙、N-甲苯磺酰腙和酮时的氮化底物在这些条件下反应良好,以高产率得到预期的酮。本文提出的方法是现有方法的一个很好的替代方案,因为它不使用金属、氧化剂、还原剂、酸性或碱性介质,并且以高产率获得酮产物。
Oxalic acid catalyzed reaction between dithioacetals and acetals. A simple and eco-friendly method for a conversion of a dithioacetal to a carbonyl compound
作者:Hideyoshi Miyake、Yuichi Nakao、Mitsuru Sasaki
DOI:10.1016/j.tetlet.2006.06.131
日期:2006.8
Oxalic acid catalyzes a reaction between dithioacetals and acetals. This reaction is useful in a new and eco-friendly method to convert dithioacetals to carbonyl compounds.