An efficient solventless method for the synthesis of N,N-dialkyl sulfonamide derivatives

Abstract

Aza-Michael addition of sulfonamides to Į,ȕ-unsaturated esters efficiently proceeds in the presence of catalytic amount of sodium hydroxide (NaOH) and tetrabutylammonium bromide (TBAB) as a phase-transfer catalyst (PTC) under microwave irradiation to afford N,N-dialkyl sulfonamides as biologically interesting compounds in good to excellent yields and short reaction times.

Resonances of the anthracenyl anion probed by frequency-resolved photoelectron imaging of collision-induced dissociated anthracene carboxylic acid

“…The angular distribution can be quantified using the anisotropy parameter, β 2 , defined from a fit to the photoelectron angular distribution at a given eKE to 61,62 I ( θ , eKE) ∝ 1 + ½[ β 2 P 2 (cos  θ )],where P 2 (cos  θ ) = 3 cos 2   θ – 1 is the second order Legendre polynomial. The two limiting values of β 2 are –1 and +2, which correspond to photoelectron emission predominantly perpendicular and parallel to the polarisation axis of the laser.…”

Molecular frame and recoil frame photoelectron angular distributions from dissociative photoionization of NO2

“…7 Due to the dynamics of the dissociation process we will consider another reference system, called recoil reference frame, whose polar axis is defined by the direction of emission of the molecular fragment detected in coincidence with the photoelectron. The photoionization dynamical coefficients are calculated in the molecular frame of reference, whose z axis is usually taken to be a symmetry axis ͑if present͒ at the time of the interaction with the photons.…”

“…[7][8][9] Although the breakdown of the axial recoil approximation complicates the connection between the experimental RFPAD and the MFPAD, one can obtain additional information about the dissociation lifetime 10,11 and fragmentation dynamics 12 when the axial recoil approximation is no longer valid. The combination of both these assumptions, that the molecule does not rotate before dissociation and that the recoil direction is determined by the initial bond direction, constitutes the axial recoil approximation.…”

Ionic Liquid-Accelerated Synthesis of Some N-Alkyl Derivatwes of Phthalimide and Sulfonamides

“…[45][46][47] Having the above aspects in mind and also in continuation of our previous studies on aza-Michael reactions, 48,49 green organic synthesis, 39,[48][49][50][51][52][53][54][55][56][57] as well as applications of K 2 CO 3 in N-alkylation reactions, 39 we report here our results on the synthesis of N-alkyl derivatives of phthalimide and sulfonamides via Michael addition of phthalimide and sulfonamides to α,β-unsaturated esters using K 2 CO 3 in [bmim]Br under microwave irradiation (Schemes 1 and 2). …”