An efficient and chemoselective method for preparation of acetals and dithioacetals of aldehydes and their deprotection under catalysis of InF3 is described.
描述了一种有效的和化学选择性的方法,用于制备醛的缩醛和二硫缩醛并在InF 3催化下将它们脱保护。
A Transition-Metal-Free and Base-Mediated Carbene Insertion into Sulfur-Sulfur and Selenium-Selenium Bonds: An Easy Access to Thio- and Selenoacetals
作者:Dhanarajan Arunprasath、Govindasamy Sekar
DOI:10.1002/adsc.201600855
日期:2017.2.20
A transition‐metal‐free and base‐mediated carbene insertion across sulfur‐sulfur and selenium‐selenium bonds has been developed by employing N‐tosylhydrazone as a stable and safe carbene precursor. The ylide formation from carbene followed by Stevens rearrangement are considered to be the key steps. This thiol and selenol‐free protocol delivers thioacetals and selenoacetals in good to excellent yields
Dithioacetalization or thioetherification of benzyl alcohols using 9-mesityl-10-methylacridinium perchlorate photocatalyst
作者:Milan Pramanik、Khokan Choudhuri、Ashis Mathuri、Prasenjit Mal
DOI:10.1039/d0cc02352c
日期:——
We report herein the use of 9-mesityl-10-methylacridinium perchlorate as the visible-light photocatalyst for dithioacetalization or thioetherification of benzyl alcohols in one pot using aerial dioxygen as a terminal oxidant. EPR analysis and Stern–Volmer quenching studies helped to rationalize the single electron transfer (SET) mechanism.
λ<sup>3</sup>
-Iodanes as Visible Light Photocatalyst in Thioacetalization of Aldehydes
作者:Khokan Choudhuri、Milan Pramanik、Prasenjit Mal
DOI:10.1002/ejoc.201900753
日期:2019.8.15
Introducing iodine(III) reagent as visible‐light photo‐catalyst for the chemoselective thioacetalization of aldehydes. Mechanistically shown that the reactions proceeded via radical pathway upon light induced hemolytic cleavage of C–I bond of the catalyst.