Direct amination of 2-(1-tosylalkyl)phenols with aqueous ammonia: a metal-free synthesis of primary amines
摘要:
A metal-free and concise method for the selective synthesis of primary amines directly from 2-(1-tosylalkyl)phenols with aqueous ammonia under mild conditions has been developed. In addition, primary amine could be conveniently converted to benzoxazinone in good yield. (C) 2015 Elsevier Ltd. All rights reserved.
Formal Asymmetric Catalytic Thiolation with a Bifunctional Catalyst at a Water-Oil Interface: Synthesis of Benzyl Thiols
作者:Wengang Guo、Bo Wu、Xin Zhou、Ping Chen、Xu Wang、Yong-Gui Zhou、Yan Liu、Can Li
DOI:10.1002/anie.201409894
日期:2015.4.7
The transformation proceeds with high yield (up to 99 %) and stereoselectivity (up to 97:3 e.r.) using water as solvent under mild conditions. The catalyst system provides a new strategy for the synthesis of optically active benzyl mercaptans. Control experiments suggested that o‐QMs are generated by the tertiary amine moiety of the squaramide organocatalyst and that the water–oil biphase is crucial
Straightforward Synthesis of Bifunctional Phosphorus Phenols via Phosphination of In Situ Generated o-Quinone Methides
作者:Zhangpei Chen、Qinglong Shi、Gongshu Wang、Siwen Chen、Jianshe Hu
DOI:10.3390/molecules23061240
日期:——
An efficient and practical approach towards bifunctional phosphorus phenols has been developed through a reaction of diphenylphosphine oxide and the o-quinone methides in situ generatedfrom 2-tosylalkyl phenols under basic conditions. This protocol features simple experimental procedures under mild conditions and is easily scaled up. With this method, a variety of diarylmethyl phosphine oxides can
A Concise Synthesis of 2-(2-Hydroxyphenyl)acetonitriles<i>via</i>the<i>o</i>-Quinone Methides Generated from 2-(1-Tosylalkyl)phenols
作者:Bo Wu、Xiang Gao、Mu-Wang Chen、Yong-Gui Zhou
DOI:10.1002/cjoc.201400463
日期:2014.10
A concise synthesis of 2‐(2‐hydroxyphenyl)acetonitriles has been developed through reaction of trimethylsilyl cyanide and the o‐quinone methides in situ generatedfrom 2‐(1‐tosylalkyl)phenols under basic conditions. In addition, 2‐(2‐hydroxyphenyl)acetonitriles could be conveniently transformed to benzofuranones.
A novel diastereodivergent tricyclization of isocyanoacetates with o-quinone methides was accomplished for the efficient synthesis of chromeno[2,3-b]chromene derivatives. All three reactive centers of isocyanoacetate reacted sequentially with two o-QMs, affording the products with four adjacent stereocenters in a diastereoselective manner. The asymmetric version was preliminarily investigated.
为了有效合成色烯[2,3- b ]色烯衍生物,完成了异氰基乙酸酯与邻醌甲基化物的新型非对映异构三环化反应。异氰基乙酸酯的所有三个反应中心依次与两个o -QM 反应,以非对映选择性的方式提供具有四个相邻立体中心的产物。对不对称版本进行了初步研究。