85236-15-3Relevant articles and documents
Synthesis of Cyclobutene-Fused Eight-Membered Carbocycles through Gold-Catalyzed Intramolecular Enyne [2+2] Cycloaddition
Iwai, Tomohiro,Ueno, Masahiro,Okochi, Hiori,Sawamura, Masaya
supporting information, p. 670 - 675 (2017/12/26)
Cationic gold(I) complexes with hollow-shaped triethynylphosphine ligands efficiently catalyzed intramolecular [2+2] cycloaddition of 1,9-enynes to afford cyclobutene-fused eight-membered carbocycles that were difficult to synthesize by other catalytic systems. Various 1,9-enynes with carbon linkers with or without a fused ring underwent efficient [2+2] cycloaddition with 5 mol% of the Au catalyst bearing the triarylmethyl-end-capped triethynylphosphine in CH2Cl2 at rt in the presence of MS 4A as an additive. More challenging 1,9-enyne substrates with fully saturated acyclic carbon linkers underwent eight-membered ring formation at 60 °C in ClCH2CH2Cl in the absence of MS 4A, forming monocyclic 1,3-dienes as major products. (Figure presented.).
Gold-catalyzed oxidative cyclizations of cis-3-En-1-ynes to form cyclopentenone derivatives
Bhunia, Sabyasachi,Ghorpade, Satish,Huple, Deepak B.,Liu, Rai-Shung
supporting information; experimental part, p. 2939 - 2942 (2012/05/20)
Golden tendencies: The title reaction for synthesizing cyclopentenone derivatives utilizes a gold complex and 8-methylquinoline oxide as the catalyst system (see scheme; IPr=1,3-bis(diisopropylphenyl)imidazol-2-ylidene). Such products are not attainable using diazocarbonyl reagents, as the gold carbenoids tend to react with C-H bonds. Copyright
12-s-Cis-Locked Retinoids (Vitamin A): Synthesis and Novel Spectral Properties
Chandraratna, Roshantha A. S.,Okamura, William H.
, p. 6114 - 6115 (2007/10/02)
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