Iminyl radicals: part II. ring opening of cyclobutyl- and cyclopentyliminyl radicals.
作者:Jean Boivin、Eric Fouquet、Samir Z. Zard
DOI:10.1016/s0040-4020(01)80850-4
日期:1994.1
Slow addition of tributylstannane to sulphenylimines 2 give the corresponding cycloiminyl radicals 3 which can undergo ring opening, a process that is easily incorporated into complex reaction sequences.
Total synthesis of (-)-periplanone-B, natural major sex-excitant pheromone of the american cockroach,
作者:Takeshi Kitahara、Masataka Mori、Kenji Mori
DOI:10.1016/s0040-4020(01)86874-5
日期:1987.1
The total synthesis of (-)-periplanone-B 1, the major sex excitant and attractant pheromone of the Americancockroach was accomplished starting from (+)-dihydrolimonene 2. Intramolecular alkylation of the substituted α-phenylthioacrylate 10 gave rise to the ()-cyclodecene 11. Second key reaction was the reductive elimination of vicinal phenylthiobenzoate 14 to provide the conjugated diene 15. Overall
Nucleophilic Trifluoromethylation of Carbonyl Compounds and Disulfides with Trifluoromethane and Silicon-Containing Bases
作者:Sylvie Large、Nicolas Roques、Bernard R. Langlois
DOI:10.1021/jo000150s
日期:2000.12.1
Provided that DMF (or another N,N-dialkylformamide) is present in the reaction medium, at least in a catalytic amount, fluoroform trifluoromethylates efficiently carbonyl compounds, even enolizable ones, when opposed to (TMS)(2)N- M+, generated in situ from N(TMS)(3) and M+ F- or RO- Na+ When F- is used ina catalytic amount, silylated alpha-(trifluoromethyl)carbinols are-obtained: in this case, the four-component system HCF3/N(TMS)(3)/catalytic F-/catalytic DMF behaves like the Ruppert's reagent, especially as far as nonenolizable carbonyl compounds are concerned (CF3SiMe3 remains more efficient for enolizable carbonyl compounds). This process involves an adduct between DMF and -CF3 which is the true trifluoromethylating agent. In the same way, fluoroform efficiently trifluoromethylates disulfides and diselenides when deprotonated with a strong base selected from t-BuOK or N(SiMe3)(3)/Me4NF (or TBAT). t-BuOK is more adapted to the trifluoromethylation of aryl disulfides whereas N(SiMe3)(3)/F- is well suited to that of aliphatic disulfides.
Cyclisation of imine radicals derived from sulphenylimines: A simple access to Δ1-pyrrolines.
作者:Jean Boivin、Eric Fouquet、Samir Z. Zard
DOI:10.1016/s0040-4039(00)94340-5
日期:1990.1
Attempt to synthesize selenium and tellurium analogs of 1,5-bis(aryl)-2,4-diaza-1,3,5-trithia-2,3-pentadienes
作者:A. V. Zibarev、S. N. Konchenko、G. G. Furin、M. A. Fedotov