Enantioselective Copper-Catalyzed Oxy-Alkynylation of Diazo Compounds
作者:Durga Prasad Hari、Jerome Waser
DOI:10.1021/jacs.7b04756
日期:2017.6.28
Enantioselective catalytic methods allowing the addition of both a nucleophile and an electrophile onto diazocompounds give a fast access into important building blocks. Herein, we report the highly enantioselective oxyalkynylation of diazocompounds using ethynylbenziodoxol-(on)e reagents and a simple copper bisoxazoline catalyst. The obtained α-benzoyloxy propargylic esters are useful building blocks
Reversibility of .eta.4-cyclobutadiene metal formation from complexed alkynes: unimolecular isomerization of labeled racemic and enantiomerically enriched .eta.5-cyclopentadienyl-.eta.4-cyclobutadiene-cobalt complexes
作者:G. Ville、K. Peter C. Vollhardt、Mark J. Winter
DOI:10.1021/ja00407a067
日期:1981.8
Evidence is presented for the reversibleformation of metal-alkyne complex in the pyrolysis of eta/sup 5/-cyclopentadienyl-eta/sup 4/-cyclobutadiene-cobalt complexes. (DLC)
Synthesis, Characterization of Spirocyclic λ
<sup>3</sup>
‐Iodanes and Their Application to Prepare 4,1‐Benzoxazepine‐2,5‐diones and 1,3‐Diynes
作者:Xu Sun、Xiao‐Qiang Guo、Lian‐Mei Chen、Tai‐Ran Kang
DOI:10.1002/chem.202005124
日期:2021.3
cycloaddition of aza‐oxyallylic cations with ethynylbenziodoxolones for synthesis of new λ3‐iodanes containing spirocyclic 4‐oxazolidinone has been developed. This cyclic λ3‐iodanes display stability in air and excellent solubility in organic solvent. Using them as substrate, both the 4,1‐benzoxazepine‐2,5‐diones and symmetrical 1,3‐diynes derivatives were afforded in high yield under copper(I)‐catalyzed
chemistry is reported. Both phenol and aromatic or aliphatic acid derivatives could be used under operator-friendly conditions (room temperature, technical solvents, under air). The discovery of the superiority of benziodoxolone-derived hypervalent iodine reagent 3d as an alkyne transfer reagent further expands the rapidly increasing utility of hypervalent iodine reagents in catalysis and is expected
or terminal propargylamines and chalcones via A3-coupling reaction of aldehydes, amines, and alkynes catalyzed by an easily available catalyst Ag2CO3 under solvent-free condition. The reaction proceeded smoothly to deliver various products in good-to-excellent yields with good functional group tolerance. Gram-scale preparation, bioactive molecule synthesis and asymmetric substrates have been demonstrated
几个简单,快速和实用的协议已被开发来合成内部或末端炔丙胺和查耳酮通过甲3 -耦合醛,胺的反应,和炔由容易获得的催化剂催化的Ag 2 CO 3无溶剂条件下进行。反应进行得很顺利,以良好的收率和良好的官能团耐受性提供了各种产品。已经证明了克级制备,生物活性分子合成和不对称底物。此外,已经提出了合成不同产物的合理机制。