Sulphamic acid: An efficient, cost-effective and recyclable solid acid catalyst for three-component synthesis of homoallylic amines

Solvent-Free Addition Reaction of Allylzinc Bromide and Aldimines

“…The spectral data for compounds 3a, [16] 3b, [17] 3c, [18] 3d, [18] 3e, [19] 3i, [20] and 3j [17] are consistent with those reported in the literature. The physical and spectra data for compounds 3f, 3g, and 3h are as follows.…”

Sulfamic acid incorporated HKUST-1: a highly active catalyst and efficient adsorbent

“…11,12 Although sulfamic acid "SA" has strong Brønsted acidity, it has a relatively poor surface area which restricts its application as solid-acid catalysts. [13][14][15] Therefore, materials with an ultrahigh surface area are used as supports to improve the distribution of SA and forming an effective heterogeneous catalyst.…”

N-Alkylated Sulfamic Acid Derivatives as Organocatalyst in Multicomponent Synthesis of Fatty Dihydropyrimidinones

“…The loading of 10 or 20 mol% of NSA 01-06 were investigated under the same experimental conditions (Scheme 2). The dihydropyrimidinone 1 was formed in good yields in all examined cases ( Table 1, entries [3][4][5][6][7][8][9][10][11][12][13][14]. The best catalytic behavior was observed when 20 mol% of organocatalyst NSA 04 was employed (Table 1, entry 10).…”

“…6 In addition, it is a heterogeneous catalyst, and can be recovered by simple filtration and is considered an efficient green catalyst. 7,8 It has been used in acid catalyzed reactions, for functional group protections 8 and deprotections, 9 and some important organic transformations, such as the Beckmann rearrangement, 10 Michael addition, 11 imino Diels-Alder, 12 Pechmann reaction, 13 esterifications, 14 transesterification, 15 Hantzsch reaction 16 and Biginelli condensations. 17 According to a previous study, 18 the pK a of SA in water is 1.19.…”