A photoredox and Brønsted acid synergistically catalyzed cross‐dehydrogenative C−Ocouplingreaction is developed in which isochroman peroxyacetals are formed through sp3 C−H bond peroxidation. The reported method is characterized by its extremely mild reaction conditions, excellent yields, and broad substrate scope. An oxocarbenium ion p‐chlorobenzenesulfonate was speculated to be the reactive intermediate
DDQ-mediated Direct C(sp<sup>3</sup>)H Cyanation of Benzyl Ethers and 1,3-Diarylpropenes under Solvent- and Metal-free Conditions
作者:Shanshan Kong、Lingqiong Zhang、Xiaoli Dai、Lianzhi Tao、Chunsong Xie、Lei Shi、Min Wang
DOI:10.1002/adsc.201500096
日期:2015.8.10
A directcyanation of benzylethers and 1,3‐diarylpropenes with TMSCN was performed under solvent‐ and metal‐free conditions. This oxidative cross dehydrative coupling (CDC) reaction was promoted by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) and provided rapid access to a broad range of nitriles in good to excellent yields.
Organocatalyzed cross-dehydrogenative coupling for C(sp3)–O bonds formation: a rapid access to α-aminoxyl isochromans
作者:Yuli Zhou、Jingwen Chen、Ahmed Ali Elsayed、Zhiguo Zhang、Zongbi Bao、Qiwei Yang、Yiwen Yang、Qilong Ren
DOI:10.1007/s10562-018-2640-9
日期:2019.2
Tetrabutyl ammonium iodide catalyzed cross-dehydrogenative coupling reaction between -C(sp(3))-H of isochromans and N-hydroxyphathalimide has been achieved using tert-butylhydroxyperoxide as theterminal oxidant. This method offers rapid access to prevalent -aminoxyl isochroman architectures. A diverse of synthetic isochromans was tolerated with this protocol, giving the corresponding product in moderate to good yields.[GRAPHICS].
CuBr2 catalyzed bromination/oxidation of isochromans to benzaldehyde derivatives
作者:Mei-Yan Zhou、Shan-Shan Kong、Ling-Qiong Zhang、Ming Zhao、Jin-Ao Duan、Zhen Ou-yang、Min Wang
DOI:10.1016/j.tetlet.2013.05.078
日期:2013.7
A series of isochromans were oxidized and brominated by using 1.2 equiv of CuBr2 in CH3CN at reflux to give the corresponding bromo benzaldehydes in moderate yields. A plausible mechanism for this transformation has been suggested. (C) 2013 Elsevier Ltd. All rights reserved.