Introduction of a clean and promising protocol for the synthesis of β-amino-acrylates and 1,4-benzoheterocycles: an emerging innovation
作者:Garima Choudhary、Rama Krishna Peddinti
DOI:10.1039/c1gc15701a
日期:——
A highly efficient, elegant and simple procedure with exceptionally mild conditions has been proposed for the synthesis of β-amino-acrylate derivatives and an array of biologically and pharmaceutically active benzoheterocycles. The protocol offers a valuable alternative to known methods and will find applications in the field of green synthesis. The regio- and stereo-chemistry of the products were established by IR, NMR and single crystal X-ray analysis.
Hydroamination Reactions of Alkynes with<i>ortho</i>-Substituted Anilines in Ball Mills: Synthesis of Benzannulated N-Heterocycles by a Cascade Reaction
electrophilic alkynes and anilines with OH, NH, or SH groups in the ortho position. For the heterocycle formation, it was shown that several stress conditions were able to initiate the reaction in the solid state. Processing in a ball mill seemed to be advantageous over comminution with mortar and pestle with respect to process control. In the latter case, significant postreaction modification occurred during
Synthesis, Structure, and Biological Activity of Products of Reactions of 3,4-Dioxohexane-1,6-dioic Acid Esters with 2-Aminophenol
作者:P. P. Mukovoz、P. A. Slepukhin、E. A. Danilova、O. P. Aysuvakova、A. P. Glinushkin
DOI:10.1134/s1070363218070022
日期:2018.7
4-benzoxazine have been prepared via reactions of 3,4-dioxohexane-1,6- dioic (ketipic) acid esters with 2-aminophenol. (2'Z)-2,2'-(2-Hydroxy-2H-1,4-benzoxazin-2-yl-3-ilidene)diacetic acid esters or (2Z)-[2-oxo-2H-1,4-benzoxazin-3(4H)-ylidene]acetic acid esters can be formed depending on the conditions. The structures of the products of dialkyl ketipate esters reactions with 2-aminophenol were determined
Efficient access to chiral dihydrobenzoxazinones <i>via</i> Rh-catalyzed hydrogenation
作者:Ziyi Chen、Xuguang Yin、Xiu-Qin Dong、Xumu Zhang
DOI:10.1039/c9ra02694k
日期:——
Rh/(S)-DTBM-SegPhos-catalyzed asymmetric hydrogenation of prochiral (Z)-2-(2-oxo-2H-benzo[b][1,4]oxazin-3(4H)-ylidene)acetate esters was successfully developed to prepare various chiral dihydrobenzoxazinones with good to excellent results.
A practical and efficient regioselective synthesis of pyrrolo-fused polyheterocycliccompounds from 2-substituted-2-hydroxy-indane-1,3-diones and 1,4-benzoxazinones via intramolecular [3+2] cycloaddition has been demonstrated. The protocol obviates column chromatography and products were isolated in good to excellent yields by simple filtration. Electronic effects of both electron-releasing and electron-withdrawing