Palladium-catalyzed anti-Markovnikov oxidative acetalization of activated olefins with iron(<scp>iii</scp>) sulphate as the reoxidant
作者:Rodney A. Fernandes、Sandhya S. Yadav、Praveen Kumar
DOI:10.1039/d1ob02227j
日期:——
efficient palladium-catalyzed anti-Markovnikov oxidative acetalization of activated terminal olefins with iron(III) sulfate as the reoxidant. This methodology requires mild reaction conditions and shows high regioselectivity toward anti-Markovnikov products and compatibility with a wide range of functional groups. Iron(III) sulphate was the sole reoxidant used in this method. Various olefins like vinylarenes
本文公开了以硫酸铁( III )为再氧化剂的活性末端烯烃的高效钯催化抗马尔科夫尼科夫氧化缩醛化反应。该方法需要温和的反应条件,并显示出对抗马尔科夫尼科夫产物的高区域选择性以及与多种官能团的相容性。硫酸铁( III ) 是该方法中使用的唯一再氧化剂。各种烯烃,如乙烯基芳烃、芳基烯丙基醚、丙烯酸芳基或苄基丙烯酸酯和高烯丙醇都反应良好,提供抗马尔科夫尼科夫缩醛,其中一些代表正交官能化的 1,3-和 1,4-二氧化化合物。
Transition-metal-free oxychlorination of alkenyl oximes: in situ generated radicals with tert-butyl nitrite
作者:Xiao-Wei Zhang、Zu-Feng Xiao、Mei-Mei Wang、Yan-Jun Zhuang、Yan-Biao Kang
DOI:10.1039/c6ob01374k
日期:——
Oxychlorination of alkenyl oximes is harder compared to the analogous oxybromination or oxyiodination because of the difficulty associated with the formation of chlorine cations or radicals. A transition-metal-free oxychlorination of alkenyl oximes has been developed, using t-BuONO as a dual oxidant and AlCl3 as a chlorine source. This convenient and practical method has been used to construct chloroisoxazolines
Ruthenium-Catalyzed Direct Transformation of Alkenyl Oximes to 5-Cyanated Isoxazolines: A Cascade Approach Based on Non-Stabilized Radical Intermediate
A convenient method offers an easy access to 5‐cyanated isoxazolines in good to high yields and shows good functional group tolerance and high efficiency. In this protocol, tert‐butyl nitrte plays a dual role, acting as an oxidant as well as a nitrogen source. Remarkably, this new reaction avoids using any toxic radical initiator or cyanide reagents and constructs C–O and C≡N triple bonds in a single‐step