A Useful Method for the Conversion of Olefins to Nitro Olefins
作者:G. Sudhakar Reddy、E. J. Corey
DOI:10.1021/acs.orglett.1c00868
日期:2021.5.7
Triflyl nitrate is easily generated from tetra-n-butylammonium nitrate in CH2Cl2 solution and serves as an effective nitrating agent for a wide range of unsaturated substrates to form nitro olefins.
DABCO-Promoted One-Pot Facile Synthesis of Angularly Fused Furoquinolinones and Furocoumarins
作者:Monoranjan Ghosh、Alakananda Hajra
DOI:10.1002/ejoc.201501152
日期:2015.12
A DABCO-promoted intermolecular cyclization between enols and nitrostyrenes has been developed for the regioselective synthesis of angularlyfused furan derivatives in high yields. This protocol is applicable to various enol derivatives, including 4-hydroxyquinolinones, 4-hydroxycoumarin, and 4-hydroxypyranone.
<i>tert-</i>
Butyl Nitrite Mediated Different Functionalizations of Internal Alkenes: Paths to Furoxans and Nitroalkenes
作者:Bilal Ahmad Mir、Sarangthem Joychandra Singh、Ritush Kumar、Bhisma K. Patel
DOI:10.1002/adsc.201800668
日期:2018.10.4
interesting and useful products. Synthesis of 1,2,5‐oxadiazole‐N‐oxides (furoxans) has been achieved from internal alkenes using tert‐butyl nitrite (TBN), quinoline and K2S2O8. Under an identical reaction condition α,β‐unsaturated carboxylic acids and cyclic and acyclic internal alkenes both afforded nitroalkenes as the sole product via decarboxylative and direct nitration path respectively.
亚硝酸叔丁酯(TBN)与各种内部烯烃的反应不同,从而产生有趣且有用的产物。使用亚硝酸叔丁酯(TBN),喹啉和K 2 S 2 O 8可从内部烯烃中合成1,2,5-恶二唑N-氧化物(呋喃烷)。在相同的反应条件下,α,β-不饱和羧酸以及环状和无环内部烯烃都分别通过脱羧和直接硝化途径提供了硝基烯烃作为唯一产物。
Efficient Preparation of TMSCCl
<sub>2</sub>
Br and Its Use in Dichlorocyclopropanation of Electron‐Deficient Alkenes
作者:Darren S. Lee、María Jesús Durán‐Peña、Laurence Burroughs、Simon Woodward
DOI:10.1002/chem.201600607
日期:2016.5.23
The reaction of excess TMSCl and LiCCl2Br at low temperature is a technically simple high yield route to TMSCCl2Br. The latter is a stable source of the dichlorobromomethide carbanion, which undergoes 1,4‐addition with cyclic nitroalkenes and (E)‐fumarates leading to dichlorocyclopropanes after bromide expulsion. For nitrostyrenes the reaction arrests at the 1,4‐addition product. Low temperature NMR
for the diversifiedsynthesis of furans and arenofurans has been developed that proceeds through K2CO3‐promoted cyclization between enols/1,3‐dicarbonyl compounds and nitroolefins at reflux in EtOH. This facile method has been successfully employed in the synthesis of benzotrifuran derivatives, which are useful hole‐transporting materials. This procedure also provides directaccess to dioxa[5]helicenes
已经开发了一种多样化合成呋喃和槟榔呋喃的通用方法,该方法通过在EtOH中回流,通过K 2 CO 3促进烯醇/ 1,3-二羰基化合物与硝基烯烃之间的环化反应来进行。这种简便的方法已成功用于苯并三呋喃衍生物的合成,苯并三呋喃衍生物是有用的空穴传输材料。该程序还提供了直接接触二氧杂[5]螺旋的方法。该反应提供了广泛的底物范围,使用了廉价的碱和对环境无害的溶剂,并且操作简单。