Base-mediated alternate route for multi-functionalized allylbenzenes using ring transformation strategy

Transition-metal-free synthesis and photophysical studies of highly functionalized (E)-stilbenes

“…The well-known methods to synthesize stilbene derivatives include transition metal couplings, such as Sonogashira, Mizoroki-Heck, Negishi, Suzuki-Miyaura, Stille, Grubbs & McMurry, Knoevenagel-Doebner, Wittig, or Horner-Wadsworth-Emmons (HWE) olefination, Ramberg-Bucklund reactions, and Perkin aldol condensation. [36][37][38] In the course of our continuous investigation into substituted aromatic systems involving donors and acceptors, [39][40][41][42][43][44][45][46] we have devised an efficient approach to craft donor-acceptor p-conjugated (D-p-A) stilbenes. In this molecule, the secondary amine at the C4 position acts as the donor group and the CN group acts as the acceptor functionality.…”

“…In the course of our continuous investigation into substituted aromatic systems involving donors and acceptors, 39–46 we have devised an efficient approach to craft donor–acceptor π-conjugated (D–π–A) stilbenes. In this molecule, the secondary amine at the C4 position acts as the donor group and the CN group acts as the acceptor functionality.…”

Synthesis of fluorescent aromatic species via ring transformation of α-pyranones and their application in OLEDs, chemosensors, and cell imaging

“…a ''push-pull'' system in the aromatic ring. [38][39][40] This intriguing approach devoid of transition metals and complex reaction setups is economical with readily available substrates and good functional group tolerance. This methodology also allows explicit functionalization of these organic fluorophores to tune their photophysical and electronic properties.…”

Ultrasound-Assisted Rapid Synthesis of Functionalized 1,2-Teraryls by Ring Transformation Methodology

“…The fascinating chemistry of 2H-pyran-2-ones has sparked much attention over the past several decades since they serve as excellent starting materials for the synthesis of a wide range of molecular structures. Recently, we have demonstrated the synthesis of 2-tetralones 20 , diarylmethanes 21 , m-terphenyls 22 , tetrahydroisoquinolines 23 , allylbenzenes 24 and prenylarenes 25 .…”

“…The fascinating chemistry of 2H-pyran-2-ones has sparked much attention over the past several decades since they serve as excellent starting materials for the synthesis of a wide range of molecular structures. Recently, we have demonstrated the synthesis of 2-tetralones, 20 diarylmethanes, 21 m-terphenyls, 22 tetrahydroisoquinolines, 23 allylbenzenes, 24 and prenylarenes. 25 In order to study the wider scope of lactone chemistry, we aimed to explore (E)-styryl acetate 2 as the possible carbanion nucleophile for the ring transformation reaction of 2H-pyran-2-ones 1.…”