Ring Synthesis from Nonheterocyclic Compounds

Acetylenic carbonyl compounds in synthesis of heterocycles using reactions with dinucleophilic reagents 87KGS291. 

Acetylenic ethers and their analogs in synthesis of heterocycles 89UK1671. 

3-Alkoxypropenic acid derivatives in synthesis of heterocycles 88MI31. Amidrazones in synthesis of heterocycles 89KGS867. a-Aminonitriles in synthesis of heterocycles 89UK250. 3-Aminothioacrylamides in heterocyclic synthesis 87ZC8. 

Asymmetric synthesis of heterocycles from olefins via cyclization with the formation of carbon-heteroatom bonds 84MI1. 

Azomethines, electrochemical heterocyclization 89MI13. Azomethineimines, cycloaddition reactions 86MI5. 

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Pyridine ring syntheses (48) can be classified into essentially two categories ring synthesis from nonheterocyclic compounds, and synthesis from other ring systems. The synthesis of pyridine derivatives by transformations on the pyridine ring atoms and side-chain atoms have been considered in the previous section. 

Ring Synthesis From Nonheterocyclic Compounds. These methods may be further classified based on the number of bonds formed during the pyridine ring formation. Synthesis of a-picoline (2) from 5-oxohexanenitrile is a one-bond formation reaction (eq. 16) (49). The nitrile is obtained by reaction between acetone and acrylonitrile (50). If both reaction steps are considered together, the synthesis must be considered a two-bond forming one, ie, formation of (2) from acetone and acrylonitrile in a single step comes under the category of two-bond formation reaction. 

Ring Synthesis from Nonheterocyclic Compounds 5.08.9.1 Introduction... 

Syntheses (General Topics and Nonconventional Synthetic Methodologies, Synthetic Strategies and Individual Methods, Versatile Synthons and Specific Reagents, Ring Synthesis from Nonheterocyclic Compounds, Syntheses by Transformation of Heterocycles). 

Ring Synthesis from Nonheterocyclic Compounds 3.14.9.LI Formation of one bond... 

Reagents, Ring Synthesis from Nonheterocyclic Compounds, Syntheses by Transformation of Heterocycles). 

Ring synthesis from nonheterocyclic compounds Arsonium ylides in synthesis of heterocycles 05T1385. 

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