ChemInform Abstract: Platinum-Catalyzed Ring Opening of 1,2-Cyclopropanated Sugars with O-Nucleophiles. Convenient Synthesis of 2-C-Branched Carbohydrates.

ChemInform ◽  
2001 ◽  
Vol 32 (3) ◽  
pp. no-no
Author(s):  
Juergen Beyer ◽  
Philip R. Skaanderup ◽  
Robert Madsen
Keyword(s):  
Ring Opening ◽  
Convenient Synthesis

scholarly journals Alkoxide-induced ring opening of bicyclic 2-vinylcyclobutanones: A convenient synthesis of 2-vinyl-substituted 3-cycloalkene-1-carboxylic acid esters

2012 ◽  
Vol 8 ◽  
pp. 650-657 ◽  
Author(s):  
Xiufang Ji ◽  
Zhiming Li ◽  
Quanrui Wang ◽  
Andreas Goeke
Keyword(s):  
Carboxylic Acid ◽  
Ring Opening ◽  
Claisen Rearrangement ◽  
Ring Cleavage ◽  
Unsaturated Ester ◽  
Supplementary Method ◽  
Convenient Synthesis ◽  
High Yields ◽  
Acid Esters

The fused 2-vinyl or 2-phenyl substituted cyclobutanones 4 undergo stereoselective ring openings by the action of alkoxide ions (t-BuO− or MeO−) to produce novel vicinally disubstituted cycloalkene derivatives 5 and 6 in moderate to high yields. The ring cleavage usually occurs with complete regioselectivity. The accessibility of γ,δ-unsaturated ester or acid derivatives makes this transformation a good supplementary method for the well-established Johnson–Claisen rearrangement.

scholarly journals A convenient synthesis strategy for microphase-separating functional copolymers: the cyclohydrocarbosilane tool box

2015 ◽  
Vol 6 (31) ◽  
pp. 5653-5662 ◽  
Author(s):  
V. Rittscher ◽  
M. Gallei
Keyword(s):  
Ring Opening ◽  
Diblock Copolymers ◽  
Ring Opening Polymerization ◽  
Convenient Synthesis ◽  
Synthesis Strategy ◽  
Anionic Ring

Functional polyhydrocarbosilane-based homo and diblock copolymers are prepared by combination of anionic ring-opening polymerization and postmodification with functional vinyl compounds.

scholarly journals A Convenient Synthesis of (16S,20S)-3β-Hydroxy-5α-pregnane-20,16-carbolactam and Its N-alkyl Derivatives

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2377
Author(s):  
Agnieszka Wojtkielewicz ◽  
Damian Pawelski ◽  
Przemysław Bazydło ◽  
Aneta Baj ◽  
Stanisław Witkowski ◽  
...  
Keyword(s):  
Ring Opening ◽  
Reductive Amination ◽  
Lactone Ring ◽  
Synthetic Route ◽  
Microwave Assisted ◽  
Alkyl Derivatives ◽  
Convenient Synthesis

A concise synthesis of (16S,20S)-3β-hydroxy-5α-pregnane-20,16-carbolactam from tigogenin via the corresponding lactone is described. The most efficient synthetic route consisted of the lactone ring-opening with aminoalane reagent followed by PDC or Dess-Martin oxidation. The oxo-amide obtained was subjected to cyclization with Et3SiH/TFA or Et3SiH/Bi(TfO)3. Alternately, the lactone was converted first to the oxo-acid, which was then subjected to the microwave-assisted reductive amination. N-Alkyl derivatives were also obtained in a similar way.

A convenient synthesis of N -vinyl enamides via the lithiation and ring-opening reaction of 2-phenyl-2-oxazolines

2017 ◽  
Vol 58 (18) ◽  
pp. 1788-1791
Author(s):  
Yi Xu ◽  
Xiao-Yu Liu ◽  
Zi-Qi Wang ◽  
Liang-Fu Tang
Keyword(s):  
Ring Opening ◽  
Ring Opening Reaction ◽  
Convenient Synthesis
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