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Indanone ring closure

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https://www.readbyqxmd.com/read/28296421/silver-catalyzed-regioselective-fluorination-of-carbonyl-directed-alkynes-synthesis-of-%C3%AE-fluoroketones
#1
Fang-Hui Li, Zhong-Jian Cai, Ling Yin, Jian Li, Shun-Yi Wang, Shun-Jun Ji
A novel silver-catalyzed fluorination reaction of carbonyl directed alkynes in the presence of N-fluorobenzenesulfonimide and water with high regioselectivities has been developed. The established protocol provides an alternative method for rapid assembly of α-fluoroketone derivatives under simple and mild reaction conditions. The reaction pathway involves a ring closure and opening process for the construction of new C-O and C-F bonds. In addition, a fluorine-containing indanone was observed through further N-heterocyclic carbene catalyzed intramolecular crossed-benzoin reaction of α-fluoroketone...
April 7, 2017: Organic Letters
https://www.readbyqxmd.com/read/12123352/synthesis-of-2-indanones-via-4-1-annulation-reactions-of-trialkylsilyl-arylketenes
#2
Audra M Dalton, Yongjun Zhang, Christopher P Davie, Rick L Danheiser
[reaction: see text] (Trialkylsilyl)arylketenes combine with (trimethylsilyl)diazomethane in a new [4 + 1] annulation process leading to 2-indanone derivatives. The (trialkylsilyl)arylketene annulation substrates are available via the photochemical Wolff rearrangement of alpha-silyl-alpha-diazo ketones, which are themselves prepared by silylation of the corresponding diazo ketones. The mechanism of the annulation reaction is proposed to involve the formation of a 2,3-bis(silyl)cyclopropanone, which is in equilibrium with an oxyallylic cation...
July 25, 2002: Organic Letters
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