4392-53-4Relevant academic research and scientific papers
Efficient and Practical Synthesis of Sulfonamides Utilizing SO2 Gas Generated on Demand
Chung Leung, Gulice Yiu,Ramalingam, Balamurugan,Loh, Gabriel,Chen, Anqi
, p. 546 - 554 (2020/04/22)
A simple and practical protocol was developed for the synthesis of sulfonamides by reacting organometallic reagents with SO2 gas generated on demand. SO2 was generated from readily available reagents safely in a highly contained and controlled fashion. The protocol allows the synthesis of sulfonamides without using either atom-inefficient SO2 surrogates or a SO2 cylinder that requires stringent storage regulations in the laboratory. The protocol was successfully applied to the synthesis of sildenafil.
A gold-catalyzed 1,2-acyloxy migration/intramolecular cyclopropanation/ring enlargement cascade: Syntheses of medium-sized heterocycles
Sun, Yin-Wei,Tang, Xiang-Ying,Shi, Min
supporting information, p. 13937 - 13940 (2015/09/07)
The synthesis of medium-sized heterocycles possessing a trans double bond is still a challenge. Herein, gold(I)-catalyzed 1,2-acyloxy migration/intramolecular cyclopropanation/ring enlargement cascade reaction of furans has been developed, providing highly efficient access to ten- and eleven-membered heterocycles with a broad substrate scope under mild reaction conditions. The reaction outcome features high chemoselectivity at the C5-position of furan. Moreover, a trans-double bond was embodied in the medium ring system.
Synthesis of N -Acyl-5-aminopenta-2,4-dienals via base-induced ring-opening of N -acylated furfurylamines: Scope and limitations
Ouairy, Cecile,Michel, Patrick,Delpech, Bernard,Crich, David,Marazano, Christian
supporting information; experimental part, p. 4311 - 4314 (2010/09/04)
N-Acylation of furfurylamines provided 1, which on double deprotonation with LDA led to the formation of N-acyl-5-aminopenta-2,4-dienals 2 via an isomerization involving opening of the furan ring. The scope and limitations of the procedure were examined by considering the influence of substituents on the carbonyl group and also on the heterocycle moiety. The efficacy of the reaction was shown to be very dependent on the nature of these groups.
Steric promotion of cyclization reactions: Substituent effect studies in the furan intramolecular Diels-Alder reaction
McNelis, Brian J.,Starr, Jeremy T.,Dang, Hung
, p. 1509 - 1513 (2007/10/03)
Seven alkyl and aryl substituted N-allyl-N-(methylfuran)-sulfonamide compounds have been synthesized and their rates of cyclization and equilibrium product concentrations determined. Increased steric bulk on the sulfonamide substituent has been shown to increase both the rate of cyclization and yields of these reactions. A three-fold increase in rate and 15% increase in yield was observed as the substituent was varied from methyl to triisopropylbenzene.
