Biocompatible ionic liquid [Betaine][H<sub>2</sub>PO<sub>4</sub>] as a reusable catalyst for the substitution of xanthen-9-ol under solvent-free conditions
作者:Anlian Zhu、Tong Wang、Wanlu Feng、Jianji Wang、Lingjun Li
DOI:10.1039/d0ra05374k
日期:——
An ionicliquid, namely [Betaine][H2PO4], was found to be an efficientcatalyst for the direct substitution reaction of xanthen-9-ol with different nucleophiles under solvent-free conditions. This catalytic system is easy to be operated and the following work-up procedure is simple, with the ionicliquidcatalystreusable for at least five cycles at a high catalytic activity level. In addition, the
离子液体,即[甜菜碱][H 2 PO 4 ],被发现是无溶剂条件下xanthen-9-ol与不同亲核试剂直接取代反应的有效催化剂。该催化体系易于操作,后续后处理程序简单,离子液体催化剂可在高催化活性水平下重复使用至少五个循环。此外,离子液体制备简单,原料廉价,生物相容性好。因此,我们的研究提出了一种有趣且可持续的直接替代酒精的方案。
C(sp<sup>3</sup>)–H Azidation Reaction: A Protocol for Preparation of Aminals
作者:Jianyang Dong、Qing Xia、Changcun Yan、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.joc.8b00235
日期:2018.4.20
tetrahydro-β-carbolines, and cyclic benzyl ethers gave high yields under mild conditions. The protocol could be carried out on a gram scale without a decrease in the yield, and the aminal products could be readily transformed into complex aminals.
The selective functionalization of saturated hydrocarbons. Part 28. The activation of benzylic methylene groups under GoAggIV and GoAggV conditions
作者:Derek H.R. Barton、Wang Tie-Lin
DOI:10.1016/s0040-4020(01)80814-0
日期:1994.1
anthracene was oxidized to give anthraquinone. Under GoAggIV and GoAggV conditions, xanthene, fluorene and diphenylmethane were oxidized to give the corresponding xanthone, fluorenone and benzophenone following two possible pathways: a) alkane to alkyl t-butylperoxide to ketone, and b) alkane to ketone, in which alkyl hydroperoxide, derived from oxygen, may be the reaction intermediate. Xanthyl azide was
A Rational Approach towards the Nucleophilic Substitutions of Alcohols “on Water”
作者:Pier Giorgio Cozzi、Luca Zoli
DOI:10.1002/anie.200800622
日期:2008.5.19
Double Cu‐Catalyzed Direct Csp<sup>3</sup>−H Azidation/CuAAC Reaction: A Direct Approach towards Demanding Triazole Conjugates
作者:Tobias Brandhofer、Aysegül Özdemir、Andrea Gini、Olga García Mancheño
DOI:10.1002/chem.201806288
日期:2019.3.15
The first one‐pot procedure for the double copper(I)‐catalyzed oxidative Csp3−H azidation–CuAAC process, implying unstable azide intermediates and easy‐to‐remove reagents under water‐tolerant conditions, is presented. The combination of tert‐butyl hydroperoxide as oxidant and TMSN3 as azide source for the C−H bond azidation, which produces harmless side‐products such as tBuOH and H2O, probed to be