本文介绍了一种高效,环保的合成β-氨基羰基化合物的方法。在不存在任何催化剂的情况下,通过使用无溶剂的氮杂-迈克尔加成反应,由氧杂冰片烯和胺成功地制备了氧杂冰片烯β-氨基酯和β-烯胺酯。氧杂降冰片烯β-氨基酯是室温下的主要产物,但较高的温度(例如90°C)导致形成β-烯胺酯。此外,所有目标化合物均通过IR,1 H NMR,13 C NMR和HR-MS表征。还提出了可能的反应途径。
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.
PIDA/TBAB-Promoted Oxidative Geminal Dibromofunctionalization of Alkynes: Direct Synthesis of Geminal Diazides
作者:Sagar Arepally、Venkata Nagarjuna Babu、Ashok Polu、Duddu S. Sharada
DOI:10.1002/ejoc.201801081
日期:2018.11.8
PIDA/TBAB-promoted oxidative geminal diazidofunctionalization of alkynes has been described for the first time. The transformation demonstrates a mechanistically distinctive approach to access geminal diazides, in which TBAB plays a crucial role as brominating agent and for the in situ generation of tetrabutylammonium azide. Furthermore, we have demonstrated here the first cycloaminative strategy by
A visible-light induced photo-click and release approach between monoarylsydnone and phenoxylfumarate was established to realize a precise dual fluorescence turn-on under light control.
The practical synthesis of polysubstituted tetrahydropyrimidines 4 from but-2-ynedioates 1, amines 2, and formaldehyde 3 through a domino process of one-pot multicomponent reactions (MCRs) and the detailed mechanistic studies are described. The MCRs were performed under extremely mild reaction conditions and offered the desired products in excellent yields. The detailed studies on the mechanism of
Enaminones in Heterocyclic Syntheses: Part 4. A New One-Step Synthetic Route to Pyrrolo[3,4-<i>b</i>]pyridine and Convenient Syntheses of 1,4-Dihydropyridines and 1,1′-(1,4-Phenylene)bis(1,4-dihydropyridine)
作者:M. M. Mashaly、S. R. El-Gogary、T. R. Kosbar
DOI:10.1002/jhet.1609
日期:2014.7
Reactions of cyano olefins with (i) enamino imides afforded novel pyrrolo[3,4‐b]pyridines; (ii) enamino esters afforded new 1,4‐dihydropyridines; and (iii) bisenamino ester afforded new1,1′‐(1,4‐phenylene)bis(1,4‐dihydropyridine). The new derivatives are planned as suggested drug candidates.
氰基烯烃与(i)烯氨基酰亚胺的反应提供了新型的吡咯并[3,4- b ]吡啶;(ii)烯氨基酯提供了新的1,4-二氢吡啶; (iii)联氨基酯提供了新的1,1'-(1,4-亚苯基)双(1,4-二氢吡啶)。新的衍生物计划作为候选药物。