An approach to synthesis of (Z)-2-chloro-1,3-diarylpropen-1-ones by Vilsmeier reagent (bis-(trichloromethyl) carbonate/DMF)
摘要:
A series of (Z)-2-chloro-1,3-diarylpropen-1-ones were unexpectedly synthesized in moderate yields by treatment of easily available 2,3-epoxy-1, 3-diarylpropan-1-ones with Vilsmeier reagent, which was derived from bis(trichloromethyl) carbonate (BTC, triphosgene) and DMF. A possible mechanism was also proposed, where sequential ring-opening, halogenation and elimination reactions were involved. (C) 2011 Wei Ke Su. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Mild and Efficient Reductive Deoxygenation of Epoxides to Olefins with Tin(II) Chloride/Sodium Iodide as a Novel Reagent
作者:Naseem Ahmed、Gulab Pathe
DOI:10.1055/s-0034-1378821
日期:——
times and high yields. A highly efficient and green protocol is reported for the reductive deoxygenation of organic epoxides to olefins usingtin(II) chloride/sodium iodide as a novel reagent. The reaction gives an excellent yield (85–96%) in ethanol under reflux within 2–10 minutes, without affecting other functional groups. The advantages of our method are the use of inexpensive reagents, the eco-friendly
A highly efficient catalytic kinetic resolution of 2,3-epoxy 3-aryl ketones via asymmetric ring-opening with pyrazole derivatives has been achieved by using a chiral N,N′-dioxide–Sc(iii) complex as the catalyst.
SnCl4–Zn: a novel reductive system for deoxygenative coupling of aliphatic, aromatic, chalcone epoxide, and indanone carbonyl compounds to olefins
作者:Gulab Khushalrao Pathe、Naseem Ahmed
DOI:10.1016/j.tetlet.2015.01.194
日期:2015.3
SnCl4–Zn complex provided a novel reductive system in the deoxygenative cross-coupling of aliphatic, aromatic, chalcone epoxide and indanone carbonyl compounds to olefins in high yield (55–86%) at reflux temperature in THF. The advantage of this reagent is inexpensive, short reaction time, and high yield compared to the reagents used in the McMurry cross-coupling reaction.
A novel domino strategy for forming poly-substituted quaternary imidazoles through a Cs2CO3-promoted aryl migration process
作者:Hai-Wei Xu、Wei Fan、Meng-Yuan Li、Bo Jiang、Shu-Liang Wang、Shu-Jiang Tu
DOI:10.1039/c3ob40666k
日期:——
A new dominostrategy for the synthesis of highly functionalized quaternary imidazole derivatives via [3 + 2] heterocyclization, involving aryl migration and ring-opening of oxirane, has been developed. This dominoreaction enables the successful assembly of three new sigma bonds including two C–N bonds in a simple operation. Features of this strategy include the mild conditions, convenient operation
generates diazoester anion, a reactive 1,3-dipole, which undergoes [3+2] annulation with chalcones to afford pyrazole ketoesters. Under similar conditions, the 1,3-dipole takes part in a [3+3] annulation with chalcone epoxides to provide pyridazine esters. Despite moderate yields, high regioselectivity, mild conditions, and functional group diversity are the salient features of this novel methodology.