Synthesis of 2,2,2‐Trifluoroethyl Oxazoles, Oxazolines and Furans via Alkyne Oxytrifluoromethylation
作者:Jia‐Jia Dong、Song‐Lin Zhang
DOI:10.1002/adsc.201901405
日期:2020.2.21
This study reports an oxytrifluoromethylation method for construction of oxazoles and furans motif and the concurrent incorporation of a 2,2,2‐trifluoroethyl group at the aromatic C5‐position. High‐valent copper(III) trifluoromethyl compounds are crucial to this reaction that induces oxy‐trifluoromethylation of alkynes with a pendant amide/enol group functioning as the oxygen‐nucleophile. A wide substrate
CuI-catalyzed cycloisomerization of propargyl amides
作者:Ali Alhalib、Wesley J. Moran
DOI:10.1039/c3ob42030b
日期:——
The synthesis of substituted dihydrooxazoles by the CuI-catalyzed cycloisomerization of terminal propargyl amides is reported.
报道了通过CuI催化的末端丙炔酰胺的环异构化合成取代二氢噁唑。
Gold‐Catalyzed Stereoselective Domino Cyclization/Alkynylation of
<i>N</i>
‐Propargylcarboxamides with Benziodoxole Reagents for the Synthesis of Alkynyloxazolines
作者:Ximei Zhao、Bing Tian、Yangyang Yang、Xiaojia Si、Florian F. Mulks、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201900264
日期:2019.7.2
highly stereoselectivesynthesis of alkynyloxazolines via a gold‐catalyzed domino cyclization‐alkynylation cascade of N‐propargylcarboxamides with benziodoxole reagents is reported. This new protocol, which represents an attractive alternative to two step sequences based on Sonagashira couplings, offers a broad substrate scope, excellent functional group tolerance, and perfect stereoselectivity. A comparison
Metal salt catalyzed process to oxazolines and subsequent formation of
申请人:Rohm and Haas Company
公开号:US06057477A1
公开(公告)日:2000-05-02
This invention relates to a process for the preparation of an .alpha.-chloroketone compound comprising the steps of (i) cyclizing an alkynyl amide to form a 5-methyleneoxazoline ##STR1## (ii) chlorinating the 5-methyleneoxazoline using trichlorolsocyanuric acid to produce a chlorinated oxazoline intermediate ##STR2## and (iii) hydrolyzing the chlorinated oxazoline intermediate with an aqueous acid to produce the desired monochloroketone ##STR3## wherein Z is alkyl or substituted alkyl, aryl or substituted aryl, heteroaryl or substituted heteroaryl or phenylene, R is a hydrogen atom or alkyl, and R.sup.1 and R.sup.2 are each independently an alkyl or substituted alkyl group, or R.sup.1 and R.sup.2 together with the carbon atom to which they are attached form a cyclic structure. Additionally, when R is a hydrogen atom, a dichloroketone can be conveniently formed through adjustment of reaction conditions.
Site-Selective Double and Tetracyclization Routes to Fused Polyheterocyclic Structures by Pd-Catalyzed Carbonylation Reactions
作者:Francesco Pancrazzi、Nicolò Sarti、Paolo P. Mazzeo、Alessia Bacchi、Carla Carfagna、Raffaella Mancuso、Bartolo Gabriele、Mirco Costa、András Stirling、Nicola Della Ca’
DOI:10.1021/acs.orglett.0c00171
日期:2020.2.21
In this contribution, we report novel palladium-catalyzed carbonylative cascade approaches to highly functionalized polyheterocyclic structures. The Pd-catalyzed carbonylative process involves the regioselective insertion of one to three CO molecules and the sequential ordered formation of up to eight new bonds (one C-O, two C-C, five C-N). The exclusive formation of six-membered heterocycles is elucidated