Cooperative Indium(III)/Silver(I) System for Oxidative Coupling/Annulation of 1,3-Dicarbonyls and Styrenes: Construction of Five-Membered Heterocycles
作者:Tae Yun Ko、So Won Youn
DOI:10.1002/adsc.201600280
日期:2016.6.16
A cooperative indium(III)/silver(I) system for the synthesis of various five‐membered heterocycles, including dihydrofurans, pyrroles, spirolactones, and spiroiminolactones, through the sequential oxidative coupling/annulation reaction of 1,3‐dicarbonyl compounds with styrenes has been developed. Four different heterocyclic systems were successfully synthesized depending on the substitution pattern
2,2-Dibromo-1,3-diketones reacted with copper powder and olefin to give 4,5-dihydrofuran derivatives in a highly regioselective fashion.
2,2-二溴-1,3-二酮与铜粉和烯烃反应,以高度区域选择性的方式生成4,5-二氢呋喃衍生物。
[3+2]-Cycloaddition reactions of 2-phenyliodonio-1,3-dioxacyclohexanemethylide: Facile synthesis of fused dihydrofuran derivatives
作者:Amalia Asouti、Lazaros P. Hadjiarapoglou
DOI:10.1016/s0040-4039(98)01997-2
日期:1998.12
Iodonium ylide 2, derived from 1,3-cyclohexadione, undergoes thermal [3+2]-cycloaddition with acetonitrile, carbon disulfide and p, p′-dimethoxythiobenzophenone with Cu(acac)2 catalysis to form the corresponding 5-membered heterocycles and alkene respectively. Photochemically 2 reacts with various alkenes and dienes to form dihydrofuranderivatives, key intermediates for paniculide A, B and pentalene
Electrochemical oxidation of 1,3-diketones in the presence of olefins afforded the formal [3+2] cycloaddition products, dihydrofuran derivatives or tetrahydrofuran derivatives. A mechanism involving attack of a radical intermediate to an olefin has been proposed.
AgBF<sub>4</sub>/[Bmim]BF<sub>4</sub>-Catalyzed [3+2] Cycloaddition of Cyclic Diazodicarbonyl Compounds: Efficient Synthesis of 2,3-Dihydrofurans and Conversion to 3-Acylfurans
A novel and efficient method for the synthesis of 2,3-dihydrofurans bearing a variety of substituents on the dihydrofuran ring was achieved by the reaction of cyclicdiazodicarbonylcompounds with styrene and vinyl acetate. The key strategy was AgBF/[Bmim]BF-catalyzed [3+2] cycloaddition. The synthesized dihydrofurans with an acetate group were further converted to the corresponding 3-acylfurans.