Sulfamic acid: An efficient and cost-effective solid acid catalyst for the synthesis of α-aminophosphonates at ambient temperature

Dicationic ionic liquids as recyclable catalysts for one‐pot solvent‐free synthesis of α‐aminophosphonates

“…Therefore, the synthesis of α-aminophosphonates has received considerable attention and substantial progress has been made to develop more efficient methods for synthesis of these compounds [3,4]. Lewis acids [5][6][7][8][9], Brønsted acids [10][11][12], solid acids [13,14], rare metal salts [15], or organo compounds [16,17] have been investigated as the catalysts for the synthesis of α-aminophosphonates over recent decades. However, the search for new, readily available, and green catalysts is still being actively pursued.…”

Kabachnik-Fields and Prins- Ritter Synthesis: Application of Ce(III) Supported on a Weakly Acidic Cation-exchanger Resin in Comparative Study

“…In this case, as catalysts can be used FeCl 3 [12], ZrCl 4 [13], SbCl 3 /Al 2 O 3 [14], Amberlyst-15 [15], sulfamic acid [16], BF 3 .Et 2 O [17], etc.…”

Silica gel and polystyrene supported aluminum chloride as heterogeneous catalysts for the preparation of α‐aminophosphonates

“…Three-component condensation of an aldehyde, an amine, and a phosphite is the most convenient method for the preparation of these compounds. Several types of catalysts were introduced previously for this purpose, such as ZrCl 4 [11], AlCl 3 [12], LiClO 4 [13], SiO 2 -NH 4 HCO 3 [14], Al(OTf) 3 [15], ionic liquid [bmim]Cl-AlCl 3 [16], Mg(ClO 4 ) 2 [17], TiCl 4 [18], Al 2 O 3 -SbCl 3 [19], ZrOCl 2 ·8H 2 O [20], TiO 2 [21], amberlyst-15 [22], [Cu(3,4-tmtppa)](MeSO 4 ) 4 [23], sulfamic acid [24], FeCl 3 [25], sodium dodecyl sulfate [26], mesoporous aluminosilicate nanocage [27], and H 3 BO 3 [28]. Most of the above-mentioned methods suffer from the drawbacks such as generation of environmentally perilous waste material, tedious workup, long reaction times, the use of malodorous trialkyl phosphite as the phosphorus nucleophile, unsatisfactory yields, complicated operations, and the use of moisture-sensitive, expensive, hazardous, difficult to handle, or unreusable catalysts.…”