Nucleophile Ringöffnung und Fragmentierung von 1-Aza-bicyclo[2.2.0]hexan Fragmentierungs-Reaktionen, 11. Mitteilung
作者:C. A. Grob、V. Krasnobajew
DOI:10.1002/hlca.19640470808
日期:——
1-Aza-bicyclo[2.2.0]hexane (1) is formed in a unimolecular reaction from 2-(2-bromoethyl)-azetidine (13) in aqueous or alcoholic medium. Thermal instability and high reactivity have, however, so far precluded its isolation. Hydrochloric acid, aqueous sodium hydroxide and ethanolic sodium ethoxide convert the bicyclic amine 1 into 4-chloro-, 4-hydroxy- and 4-ethoxy-piperidine, (14), (15) and (16), respectively
Nickel-Catalyzed One-Pot Suzuki-Miyaura Cross-Coupling of Phenols and Arylboronic Acids Mediated by<i>N</i>,<i>N</i>-Ditosylaniline
作者:Liangshun Chen、Hongyue Lang、Lei Fang、Mengyun Zhu、Jinqian Liu、Jianjun Yu、Limin Wang
DOI:10.1002/ejoc.201402475
日期:2014.8
bonds through the Ni-catalyzed Suzuki–Miyauracross-coupling of phenols with arylboronicacids has been developed. This reaction proceeds through the in situ tosylation of phenols by using N,N-ditosylaniline as the sulfonylating reagent, which is highly active, markedly stable, and easily prepared. The scope with respect to the coupling partners – phenols and boronic acids – is broad, and sensitive functional
已经开发出一种通过苯酚与芳基硼酸的 Ni 催化 Suzuki-Miyaura 交叉偶联来构建两个不同 Cary-Caryl 键的有效方法。该反应以N,N-二甲苯磺酰苯胺为磺酰化试剂,通过苯酚的原位甲苯磺酰化反应进行,磺酰化试剂活性高、稳定性好、制备容易。偶联伙伴(酚类和硼酸)的范围很广,并且可以容忍敏感的官能团。酚类,尤其是那些含有未保护氨基的酚类,在传统的一锅法条件下通常存在偶联问题,也是该转化中可行的底物。