Expedient Diels–Alder assembly of 4-aryl-4-phenylsulfonyl cyclohexanones
摘要:
The efficient preparation of 4-aryl-4-phenylsulfonyl cyclohexanones. containing a quaternary sulfone-bearing carbon centre, is described. Their synthesis proceeds in 38-78% overall yield by way of three steps: (i) sulfinate alkylation: (ii) methylenation: and (iii) regioselective Diels-Alder condensation with 2-trimethylsiloxybutadiene. The scope and limitations of the one-pot Mannich-type methylenation described were examined. (C) 2004 Elsevier Ltd. All rights reserved.
3,6,8-tetrabromopyrene with 4-[(–)-β-citronellyloxy]phenylethyne was employed to synthesize 1,3,6,8-tetra[4-(citronellyloxy)phenylethynyl]pyrene. The pyrene derivative catalyzed the reductive desulfonylation of ethenyl sulfones via visible-light irradiation (514 nm green light-emitting diodes) in the presence of i-Pr2NEt. The β-citronellyloxy groups provided the sufficient solubility to the highly
Ni-catalyzed non-activated C–S bond cleavage at ambient temperature for the synthesis of sulfur-containing polycyclic compounds
作者:Takanori Shibata、Ayato Sekine、Mika Akino、Mamoru Ito
DOI:10.1039/d1cc03226g
日期:——
tetracyclic compounds at ambient temperature. The transformation was initiated by non-activated sp2 C–S bond cleavage along with consecutive alkyne insertions. A double intramolecular reaction of a tetrayne and an intermolecular reaction of monoynes were also available, and the corresponding polycyclic compounds were obtained. Moreover, the obtained cycloadduct showed photo-catalytic activity in benzylic
Base-controlled divergent synthesis of vinyl sulfones from (benzylsulfonyl)benzenes and paraformaldehyde
作者:Fuhong Xiao、Yangling Hu、Huawen Huang、Fen Xu、Guo-Jun Deng
DOI:10.1039/d0ob00362j
日期:——
A tuneable metal-free protocol for the selective preparation of α-substituted vinyl sulfone and (E)-vinyl sulfone derivatives has been described. The base played an important role in the selectivity control of transformation.
Modular Synthesis of Triarylmethanes through Palladium-Catalyzed Sequential Arylation of Methyl Phenyl Sulfone
作者:Masakazu Nambo、Cathleen M. Crudden
DOI:10.1002/anie.201307019
日期:2014.1.13
Triarylmethanes, which are valuable structures in materials, sensing and pharmaceuticals, have been synthesized starting from methylphenylsulfone as an inexpensive and readily available template. The three aryl groups were installed through two sequential palladium‐catalyzed CH arylation reactions, followed by an arylative desulfonation. This method provides a new synthetic approach to multisubstituted
Nucleophilic reactivities of benzenesulfonyl-substituted carbanions
作者:Florian Seeliger、Herbert Mayr
DOI:10.1039/b805604h
日期:——
Kinetics of the reactions of four benzenesulfonyl-stabilized carbanions (1a-d)- with reference electrophiles (quinone methides 2 and diarylcarbenium ions 3) have been determined in dimethyl sulfoxide solution at 20 degrees C in order to derive the reactivity parameters N and s according to the linear free-energy relationship logk(20 degrees C) = s(N + E) (eqn (1)). The additions of (1a-d)- to ordinary