以前未知的1,2-二氢-1-氮杂-2-硼菲是从2-溴-1-乙烯基萘仅三步合成的。已测试了这种新的BN菲和几种取代衍生物对溴和有机锂化合物的反应性。溴化以完全的区域选择性进行,得到适合于通过交叉偶联反应进一步官能化的溴取代的化合物。相对于菲,这个新的BN菲族显示出量子产率的显着提高(最高达ϕ F = 0.93)。
Intramolecular Crossed [2+2] Photocycloaddition through Visible Light-Induced Energy Transfer
作者:Jiannan Zhao、Jonathan L. Brosmer、Qingxuan Tang、Zhongyue Yang、K. N. Houk、Paula L. Diaconescu、Ohyun Kwon
DOI:10.1021/jacs.7b05277
日期:2017.7.26
Herein, we present the intramolecular [2+2] cycloadditions of dienones promoted through sensitization, using a polypyridyl iridium(III) catalyst, to form bridged cyclobutanes. In contrast to previous examples of straight [2+2] cycloadditions, these efficient crossed additions were achieved under irradiation with visible light. The reactions delivered desired bridged benzobicycloheptanone products with
A Transient Directing Group Strategy Enables Enantioselective Multicomponent Organofluorine Synthesis
作者:Zhonglin Liu、Lucas J. Oxtoby、Mingyu Liu、Zi-Qi Li、Van T. Tran、Yang Gao、Keary M. Engle
DOI:10.1021/jacs.1c03178
日期:2021.6.23
6-trimethylpyridinium hexafluorophosphate facilitated by a transient directing group. The synthetically enabling methodology constructs vicinal stereocenters with excellent regio-, diastereo-, and enantioselectivities, forging products that map onto bioactive compounds.
the Hoveyda–Grubbs complex bearing S‐, Br‐, I‐, and N‐coordinating naphthalene ligands were synthesized and characterized with NMR and X‐ray studies. Depending on the arrangement of the coordinating sites on the naphthalene core, the isomeric catalysts differ in activity in model metathesis reactions. In particular, complexes with the RuCH bond adjacent to the second aromatic ring of the ligand suffer
合成了带有S,Br,I和N配位萘配体的Hoveyda-Grubbs络合物的衍生物,并通过NMR和X射线研究对其进行了表征。根据对萘核心协调点的安排,同分异构催化剂活性模型复分解反应是不同的。特别地,相邻的所述第二芳环配体复合物与RuCH键从经历了它们的制备方法和起始困难受到影响。行为最有可能从周围的双键和排斥intraligand相互作用,其导致亚苄基的质子的异常化学位移位阻导出与观察到1 1 H NMR。此外,EXSY研究表明,卤素螯合的钌配合物表现出平衡,其中主要顺-Cl 2结构伴随有少量的异构体形式。通常,次要形式,在80℃下,用催化剂的观察到的活性的趋势相关成分测量内容,虽然一些例外复杂化机械图片。我们假设家庭卤素螯合复分解催化剂的启动机制开始与顺-Cl 2 ⇌反式-Cl 2异构化,虽然进一步的措施可能成为限速选择系统。