报道了一种通过S N 2'机理进行铜催化的乙烯基环状碳酸酯的硼烷基甲基化和硼化的方法。这些奇异反应包括选择性的S N 2'烯丙基取代,伴随有环状碳酸酯的开环,以及CO 2的挤出和在单个步骤中形成有用的羟基官能团。可以控制均烯丙基硼化和烯丙基硼化过程的立体选择性,并且合成上有用的不饱和(E)-戊-2-烯-1,5-二醇和(E)-丁-2-烯-1,4-二醇是访问。
Highly Efficient Catalytic Formation of (<i>Z</i>)-1,4-But-2-ene Diols Using Water as a Nucleophile
作者:Wusheng Guo、Luis Martínez-Rodríguez、Eddy Martin、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1002/anie.201603638
日期:2016.9.5
The first general catalytic and highly stereoselective formation of (Z)‐1,4‐but‐2‐ene diols is described from readily available and modular vinyl‐substituted cyclic carbonate precursors using water as a nucleophilicreagent. These 1,4‐diol scaffolds can be generally prepared in high yields and with ample scope in reaction partners using a simple synthetic method that does not require the presence of
The present invention provides compounds that modulate the activity of Janus kinases and are useful in the treatment of diseases related to activity of Janus kinases including, for example, immune-related diseases, skin disorders, myeloid proliferative disorders, cancer, and other diseases.
Herein, an efficient and practical approach for dipolarmodification of commercially available solid catalysts is reported. The solid catalysts HMS (hexagonal mesoporous silica)-DMSO decorated with organic dipolar layers are designed and synthesized by radiation technology under simple and accessible conditions. The dipolarcatalysts can serve as platforms to introduce various active sites, benefiting
在此,报道了一种对市售固体催化剂进行偶极改性的有效且实用的方法。采用辐射技术在简单易得的条件下设计合成了有机偶极层修饰的固体催化剂HMS(六方介孔二氧化硅)-DMSO。偶极催化剂可以作为引入各种活性位点的平台,受益于偶极层的灵活性和多样性,这反过来又使它们能够在相对友好的系统中实现催化性能。具体而言,升级后的偶极催化剂 HMS-DMSO-SO 3 H 在将氧化的木质素模型化合物 α-羟基苯乙酮转化为 1,3-二氧戊环衍生物以及将异麦芽酮糖脱水为糖基氧基甲基糠醛 (GMF) 方面表现出良好的性能。