Ring Cleavage Reactions

2015 ◽  
pp. 15-56
Keyword(s):  
Ring Cleavage ◽  
Cleavage Reactions

Cleavage of the Epimines of 1,6-Anhydrohexoses with Fluoride Anion

2005 ◽  
Vol 70 (12) ◽  
pp. 2075-2085 ◽  
Author(s):  
Jiří Kroutil ◽  
Klára Jeništová
Keyword(s):  
Fluoride Anion ◽  
Ring Cleavage ◽  
Protecting Group ◽  
Reaction Conditions ◽  
Aziridine Ring ◽  
Cleavage Reactions ◽  
Derivatives Of ◽  
Fluoro Derivatives

Aziridine ring cleavage reactions of five N-nosylepimines (2-6) having D-talo, D-galacto, D-manno, and D-allo configurations with potassium hydrogendifluoride under various reaction conditions have been performed. The cleavage regioselectively afforded diaxial isomers of vicinal amino-fluoro derivatives of 1,6-anhydro-β-D-gluco- and mannopyranose 7-11 in 51-94% yields. Removal of 2-nitrobenzenesulfonyl protecting group with benzenethiol has been attempted in the case of compound 10.

Cleavage Reactions of 5-Arylazo Derivatives of 1-Methyl-2-benzyl-2-imidazolin-4-ones

1975 ◽  
Vol 30 (7-8) ◽  
pp. 603-605 ◽  
Author(s):  
Nazmi Abdel Latif Kassab ◽  
Abdel Hamid Harhash ◽  
Sanna Osman Abd Allah
Keyword(s):  
Sodium Hydroxide Solution ◽  
Aqueous Sodium Hydroxide ◽  
The Other ◽  
Ring Cleavage ◽  
Prolonged Heating ◽  
Aqueous Sodium Hydroxide Solution ◽  
Aqueous Sodium ◽  
Triazine Derivatives ◽  
Cleavage Reactions ◽  
Derivatives Of

The 5-arylazo-1-methyl-2-benzyl-2-imidazolin-4-ones (1 a-c) undergo ring cleavage with 1% aqueous sodium hydroxide solution affording α-arylhydrazono-phenacetyl-sarcosine amide (2). Prolonged heating of 1 and 2 with the same reagent yields the cyanamide (3). On the other hand, when 1 a-c were refluxed with acetic acid the triazinones (4) were obtained. The latter adds one mole of Grignards reagent to yield the 5-hydroxy-1,2,4-triazine derivatives (5).

New Ring Cleavage Reactions and Recyclizations Starting from 1,2,3-Thiadiazoles

1999 ◽  
Vol 153 (1) ◽  
pp. 427-428
Author(s):  
Wim Dehaen ◽  
Marieke Voets ◽  
Mario Smet ◽  
Stefan Smeets
Keyword(s):  
Ring Cleavage ◽  
Cleavage Reactions

Reversible Cyclopropane Ring-Cleavage Reactions within Etheno-Bridged [4.3.1]Propelladiene Frameworks Leading to Aza- and Oxa-[5.6.5.6]fenestratetraenes

2012 ◽  
Vol 18 (43) ◽  
pp. 13585-13588 ◽  
Author(s):  
Nora Heinrich ◽  
Anthony C. Willis ◽  
Ian A. Cade ◽  
Junming Ho ◽  
Michelle L. Coote ◽  
...  
Keyword(s):  
Cyclopropane Ring ◽  
Ring Cleavage ◽  
Cleavage Reactions

Ring Cleavage Reactions of trans-2-Amino-3a,4,5,6,7,7a-hexahydrobenzoxazole

1961 ◽  
Vol 26 (2) ◽  
pp. 444-446 ◽  
Author(s):  
RAYMOND R. WITTEKIND ◽  
JANET D. ROSENAU ◽  
GEORGE I. POOS
Keyword(s):  
Ring Cleavage ◽  
Cleavage Reactions
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