67404-97-1Relevant articles and documents
Tandem Blaise/retro-Blaise reaction for the nitrile-mediated regioselective intermolecular addition of unstabilized zinc ester enolates (Reformatsky Reagents) to 1-alkynes and 1,3-enynes
Kim, Ju Hyun,Chun, Yu Sung,Lee, Sang-Gi
, p. 11483 - 11493 (2013/12/04)
We report the novel use of a nitrile as a mediator to achieve the regioselective intermolecular addition of unstabilized zinc ester enolates (Reformatsky reagents) to 1-alkynes and 1,3-enynes. This reaction is made possible by a reversible addition of enolates to a nitrile (Blaise reaction), generating a zinc aza-enolate that, unlike zinc ester enolates, can add intermolecularly to 1-alkynes and 1,3-enynes. Subsequent removal of the nitrile through a retro-Blaise reaction generates the targeted addition product. This method is combined with a Diels-Alder reaction and subsequent oxidative aromatization, providing a tandem one-pot de novo construction of α-arylated alkanoates from Reformatsky reagents.
A BREAKTHROUGH FOR THE PHOTOCHEMICAL ARYLATION IN THE 3-(PHENYLMETHYL)-2(5H)-FURANONE SYSTEM LEADING TO THE TETRAHYDROINDENOFURANONE SYSTEM
Muraoka, Osamu,Tanabe, Genzoh,Sano, Kyohko,Momose, Takefumi
, p. 1093 - 1096 (2007/10/02)
The photochemistry of the 'central methane'-substituted 3-benzyl-2(5H)-furanone system (1) is described.Despite its di-?-methane structure, photochemical arylation was found to predominate in place of the di-?-methane rearrangement, and gave substituted t
A Two-Step Preparation of α-Alkylidene γ-Lactones from γ-Lactones: A Synthesis of (+/-)-Ancepsenolide
Larson, Gerald L.,Perez, Rosa M. Betancourt de
, p. 5257 - 5260 (2007/10/02)
γ-Butyrolactone, γ-valerolactone, and the cis lactone of 2-hydroxycyclohexaneacetic acid have been C-silylated via their respective lithium enolates with diphenylmethylchlorosilane.The resulting α-silylated γ-lactones can be deprotonated and condensed with aldehydes and ketones to give α-alkylidene γ-lactones in moderate to excellent yield.The enolate of the α-diphenylmethylsilyl cis lactone of 2-hydroxycyclohexaneacetic acid condensed with 1-butanal but not with benzaldehyde or acetaldehyde.