Development of Triazine-Based Benzylating Reagents Possessing <i>t</i>-Butyl Group on the Triazine Core: Thermally Controllable Reagents for the Initiation of Reaction
作者:Yukiko Karuo、Kohei Yamada、Munetaka Kunishima
DOI:10.1248/cpb.c17-00897
日期:——
Benzylatingreagents, 4-(4,6-di-t-butyl-1,3,5-triazin-2-yl)-4-benzylmorpholinium triflate, and related derivatives have been developed. The reagentsreleasebenzyl triflate as a benzylcationequivalent upon heating the solution to 40°C under neutral conditions. The O-benzylation of alcohols using a stoichiometric amount of these reagents afforded corresponding benzyl ethers in good to high yields
A Novel Acid-Catalyzed <i>O</i>-Benzylating Reagent with the Smallest Unit of Imidate Structure
作者:Kohei Yamada、Hikaru Fujita、Munetaka Kunishima
DOI:10.1021/ol302222p
日期:2012.10.5
trimerization of the smallest unit of benzyl imidate leads to 2,4,6-tris(benzyloxy)-1,3,5-triazine (TriBOT), which can be used as an acid-catalyzed O-benzylating reagent. The reaction of various functionalized alcohols with 0.4 equiv of TriBOT in the presence of trifluoromethanesulfonic acid afforded the benzyl ethers in good yields. TriBOT is an inexpensive stable crystalline solid with high atom economy
A new O‐benzylatingreagent, that is, 4‐(4,6‐diphenoxy‐1,3,5‐triazin‐2‐yl)‐4‐benzylmorpholinium trifluoromethanesulfonate (DPT‐BM), has been developed. Benzylcationequivalents are generated from DPT‐BM by dissolving the compound in a solvent at roomtemperature under non‐acidic conditions. The benzylation of various alcohols by using a combination of DPT‐BM and magnesium oxide provided the benzyl
Diallyltriazinedione‐type alkylating agents (ATTACKs‐R) with various alkyl groups (R) have been developed for the acid‐catalyzed alkylation of alcohols. ATTACKs‐R were prepared through a palladium‐catalyzed O‐N allylic rearrangement of 2,4‐bis(allyloxy)‐6‐chloro‐1,3,5‐triazine followed by substitution of the chloro group with an alcohol.