Water Compatible Multicomponent Cascade Suzuki/Heck-Aldol, Suzuki-Aldol-Suzuki, and Aldol-Suzuki-Aldol Reactions: An Ecofriendly Paradigm for Multiple CarbonCarbon Bond Formation in One Pot

Coumarin as a Surrogate for Protection-group-free Synthesis of o-Hydroxy Stilbenes: Hydrolysis-Decarboxylation-Heck Coupling Reactions in One pot

2-Hydroxystyrylbenzene scaffold is found in various compounds that are widely applicable in medicinal chemistry as well as material chemistry. Here, a successful attempt is made to develop a one-pot protocol for the synthesis of 2-hydroxystilbene derivatives via hydrolysis of natural coumarins followed by in situ decarboxylative Heck coupling with haloarenes. Fine tuning of the reaction conditions allowed exclusive formation of 2-hydroxystyrylbenzenes over other possible side products i.e. benzofuran/substituted coumarins.

Cooperative catalysis by bovine serum albumin-iodine towards cascade oxidative coupling-C(sp(2))-H sulfenylation of indoles/hydroxyaryls with thiophenols on water

Cooperative cascade catalysis by bovine serum albumin (BSA)-iodine allows for the first time the performance of C(sp(2))-H sulfenylation of indole from readily available thiophenol (-SH bond) via in situ generation/cleavage of disulfide (S-S bond) in air under aqueous conditions, whereas BSA or I2 individually do not permit this two step sequence to occur in the same pot towards C-S bond formation. This green cooperative protocol is extendable to sulfenylation of hydroxyaryls (i.e. 2-naphthol or 4-hydroxycoumarin) with diverse thiols (aryl/heteroaryl) without using any toxic metal catalysts, bases or oxidants, thus rendering the process environmentally and economically reliable. Further, the gram scale synthesis of a COX-2 inhibitor (3-(pyridin-2-ylthio)-1H-indole), regioselectivity and recyclability (up to four cycles) are the additional merits of this cooperative cascade bio-chemocatalytic (BSA-I2) protocol. Moreover, HPLC and ESI-MS provide powerful insights into the mechanistic aspects of the above cascade sulfenylation reaction.

Naphtho[b]-fused BODIPYs: one pot Suzuki–Miyaura–Knoevenagel synthesis and photophysical properties

The facile one-pot synthesis of naphtho[b]-fused BODIPYs and their photophysical properties are reported.

Polyaniline coated on celite, a heterogeneous support for palladium: applications in catalytic Suzuki and one-pot Suzuki–aldol reactions

Polyaniline was heterogenized on celite particles and used as a support for palladium metal ions. The catalyst was found to be effective in Suzuki–Miyaura and its one-pot aldol reactions.

Four-component reaction between naphthols, substituted β-nitrostyrenes, substituted benzaldehydes and ammonium acetate in water–PEG-400: an approach to construct polysubstituted naphthofuranamines

The diversity-oriented synthesis of naphtho[b]furans via a four-component reaction between naphthanols, substituted β-nitrostyrenes, substituted benzaldehydes and ammonium acetate has been developed.

Amino acid and water-driven tunable green protocol to access S–S/C–S bonds via aerobic oxidative coupling and hydrothiolation

Arginine in conjunction with water has been employed as an effective and recyclable organocatalyst for oxidative coupling of thiophenols and hydrothiolation of alkynes.

Multicomponent diversity-oriented synthesis of symmetrical and unsymmetrical 1,4-dihydropyridines in recyclable glycine nitrate (GlyNO3) ionic liquid: a mechanistic insight using Q-TOF, ESI-MS/MS

Glycine nitrate (GlyNO₃) ionic liquid has been explored for the synthesis of symmetrical and unsymmetrical 1,4-DHPs in good-to-excellent yields with mechanistic studies using Q-TOF and ESI-MS/MS.