Solvent-free three component Strecker reaction of ketones using highly recyclable and hydrophobic sulfonic acid based nanoreactors

Sulfonated Ordered Nanoporous Carbon (CMK-5-SO3H) as an Efficient and Highly Recyclable Catalyst for the Silylation of Alcohols and Phenols with Hexamethyldisilazane (HMDS)

“…Accordingly, the total weight loss reaches 22.4%. Due to the attributes described above for the use of sulfonated ordered nanoporous carbon in catalysis and our current interest in developing environmentally benign synthetic protocols for different organic transformations [41,[54][55][56], we reveal herein for the first time, highly reusable CMK-5-SO 3 H catalyzed trimethylsilylation of a wide variety of alcohols and phenols at ambient temperature (Scheme 1).…”

Expeditious and efficient synthesis of Strecker’s α-aminonitriles catalyzed by sulfated polyborate

“…18 Protocols based on TMSCN often require variety of Lewis or Bronsted acid catalyst such as Pr(OTf) 3 , 19 Yb(OTf), 20 Cu(OTf) 2 32 Montmorillonite KSF, 33 polymer-supported Sc(OTf) 3,34 silica-supported heteropoly acids, 35 cellulose sulfuric acid, 36 alumina supported tungstosilicic acid, 37 SBA-15 supported sulfonic acid, 38 sulfamic acid functionalized magnetic Fe 3 O 4 nanoparticles, 39 H 2 SO 4/ Silica gel, 40 silica-bonded S-sulfonic acid, 41 sulphated tungstate, 42 MCM-41 anchored sulfonic acid, 43 nano magnetic sulfated zirconia, 44 sulfamic acid, 45 and xanthan sulfuric acid. 46 However, many of these methods suffer from several shortcomings such as low reactivity, unsatisfactory yields, moisture sensitive nature, longer reaction time, harsh reaction conditions, tedious workup, generation of toxic byproducts, use of expensive, metal-based, corrosive/toxic catalysts or reagent.…”

Hydrophobic Propylsulfonic Acid Functionalized Nanostructured SBA-15: A Highly Reusable and Green Catalyst in the Solvent-Free Tetrahydropyranylation of Alcohols and Phenols

“…Therefore, in connection with our research programs aimed at the utility of this nanostructured solid acids for different organic transformations, [48][49][50][51][52] herein, we investigated the application of SBA-15-Ph-Pr-SO 3 H as a highly effective and reusable catalyst in tetrahydropyranylation of alcohols and phenols in solvent-free conditions at ambient temperatures (Figures 1 and 2). …”

“…Recently, we demonstrated the application of a heterogeneous and hydrophobic sulfonic acid nanoreactor with both acidic sites and phenyl groups inside the mesochannel of SBA-15 as an efficient, environmentally benign, and highly recoverable catalyst for both Pechmann [48] and Strecker [49] reactions. Therefore, in connection with our research programs aimed at the utility of this nanostructured solid acids for different organic transformations, [48][49][50][51][52] herein, we investigated the application of SBA-15-Ph-Pr-SO 3 H as a highly effective and reusable catalyst in tetrahydropyranylation of alcohols and phenols in solvent-free conditions at ambient temperatures (Figures 1 and 2).…”