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.
Metal salt catalyzed process to oxazolines and subsequent formation of chloroketones
申请人:Dow AgroSciences LLC
公开号:EP0952143B1
公开(公告)日:2003-01-22
US6057477A
申请人:——
公开号:US6057477A
公开(公告)日:2000-05-02
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。
Ir-Catalyzed Asymmetric Cascade Allylation/Spiroketalization Reaction for Stereoselective Synthesis of Oxazoline-Spiroketals
作者:Hui Yan、Xusheng Shao、Xiaoyong Xu、Zhong Li、Wu-Lin Yang
DOI:10.1021/acs.orglett.2c03885
日期:2023.1.20
An asymmetric cascade allylation/spiroketalization reaction between 2-(1-hydroxyallyl)phenols and 5-methyleneoxazolines is accomplished by using a chiral Ir(I) catalyst derived from commercially available iridium precursor and the Carreira ligand. This protocol furnishes a class of structurally novel and unique oxazoline-spiroketals in up to 86% yield, >99% ee and >20:1 dr. Moreover, control experiments
2-(1-羟基烯丙基) 酚和 5-亚甲基恶唑啉之间的不对称级联烯丙基化/螺缩酮化反应是通过使用衍生自市售铱前体和 Carreira 配体的手性 Ir(I) 催化剂完成的。该方案提供一类结构新颖且独特的恶唑啉-螺缩酮,产率高达 86%,>99% ee 和 >20:1 dr。此外,对照实验表明,5-亚甲基恶唑啉上的 4,4-二取代对于避免芳构化和发生螺缩酮化是必要的。在此基础上,说明了一个似是而非的反应机理。