An efficient synthesis of 2-bromo(chloro)-3-selenyl(sulfenyl)indoles via tandem reactions of 2-(gem-dibromo(chloro)vinyl)anilines with diselenides(disulfides)
Evidence of a Nitrene Tunneling Reaction: Spontaneous Rearrangement of 2-Formyl Phenylnitrene to an Imino Ketene in Low-Temperature Matrixes
作者:Cláudio M. Nunes、Stephanie N. Knezz、Igor Reva、Rui Fausto、Robert J. McMahon
DOI:10.1021/jacs.6b07368
日期:2016.11.30
Triplet 2-formyl phenylnitrene was generated by photolysis of 2-formyl phenylazide isolated in Ar, Kr, and Xe matrixes and characterized by IR, UV-vis, and EPR spectroscopies. Upon generation at 10 K, the triplet nitrene spontaneously rearranges in the dark to singlet 6-imino-2,4-cyclohexadien-1-ketene on the time scale of several hours. The intramolecular [1,4] H atom shift from the nitrene to the
三重 2-甲酰基苯氮卓是通过在 Ar、Kr 和 Xe 基质中分离的 2-甲酰基苯叠氮的光解产生的,并通过 IR、UV-vis 和 EPR 光谱进行表征。在 10 K 下生成后,三线态氮烯在黑暗中自发地重排为单线态 6-亚氨基-2,4-环己二烯-1-烯酮,时间为数小时。分子内 [1,4] H 原子从氮烯转移到亚氨基乙烯酮是通过在三重态流形上的隧穿发生的,然后是系统间交叉。这个案例构成了涉及氮烯的隧道反应的第一个直接证据。
A Highly Selective Tandem Cross-Coupling of <i>gem</i>-Dihaloolefins for a Modular, Efficient Synthesis of Highly Functionalized Indoles
作者:Yuan-Qing Fang、Mark Lautens
DOI:10.1021/jo701987r
日期:2008.1.1
A highly efficient method of indole synthesis using gem-dihalovinylaniline substrates and an organoboron reagent was developed via a Pd-catalyzed tandem intramolecularamination and an intermolecular Suzuki coupling. Aryl, alkenyl, and alkyl boron reagents are all successfully employed, making for a versatile modular approach. The reaction tolerates a variety of substitution patterns on the aniline
A facile, one-pot approach for synthesizing deuterated aldehydes from arylmethyl halides was developed using D2O as the deuterium source. The efficient process is realized by a sequence of formation, H/D exchange, and oxidation of pyridinium salt intermediates. The mild and air-compatible reaction conditions enable efficient synthesis of diverse deuterated aldehydes with high deuterium incorporation
Ortho effects in schiff bases of diaminodicyanoethene
作者:G. Holzmann、H. W. Rothkopf
DOI:10.1002/oms.1210150208
日期:1980.2
AbstractIn the electron impact mass spectra of azomethines derived from various substituted aromatic aldehydes and diarninodicyanoethene the superposition of two ortho effects concurring with the azomethine group is apparent: one involving the amino group of the diaminodicyanoethene part accounts for the cyclization to [C5H3N4]+ ions and the other involving ortho substituents of the benzylidene part which can interact with the azomethine moiety is responsible for specific fragment ions, suppressing the typical fragmentations of azomethines. The ortho effect was studied for the o‐nitro derivative by labelling experiments, analysis of metastable transitions and collisional activation comparing model ions, demonstrating that the specific [M‐H2O]+˙ and [C7H5NO2]+˙ ions are the result of cyclization processes.