756491-88-0Relevant articles and documents
Nucleophilic 5- Endo - Trig cyclization of 3,3-difluoroallylic metal enolates and enamides: Facile synthesis of ring-fluorinated dihydroheteroles
Fujita, Takeshi,Ikeda, Masahiro,Hattori, Masahiro,Sakoda, Kotaro,Ichikawa, Junji
, p. 1493 - 1505 (2014/06/10)
Metal enolates and enamides bearing difluoroallylic moieties underwent nucleophilic 5-endo-trig cyclization, a process considered to be disfavored according to Baldwin's rules. Whereas no C-cyclization was observed in these reactions, O- and N-cyclization proceeded exclusively to afford 5-fluorinated 2-alkylidene-2,3-dihydrofurans and -2,3-dihydropyrroles, respectively. Georg Thieme Verlag Stuttgart New York.
SmI2-mediated 3-exo-trig cyclisation of δ-oxo-α, β-unsaturated esters to cyclopropanols and derivatives
Bezzenine-Lafollée, Sophie,Guibé, Francois,Villar, Hélène,Zriba, Riadh
, p. 6931 - 6944 (2007/10/03)
In the presence of samarium diiodide and a proton source, δ-oxo-γ,γ-disubstituted-α,β-unsaturated esters of general formula R-CO-C(R′,R′)-CHCH-CO2Bn readily cyclise to trans-cyclopropanol products and/or lactones derived from the cis isomers. F