Insertion reactions of diazo compounds with some selenium(II) electrophiles
作者:Thomas G. Back、Russell G. Kerr
DOI:10.1016/0022-328x(85)88004-9
日期:1985.5
with diazomethane and several α-diazo esters to afford α-arylseleno isothiocyanates (5a–10a) and the isomeric thiocyanates (6b–8b) as the major and minor products, respectively. Analogous insertion reactions were observed with benzenesulfenyl thiocyanate (3) and benzeneselenenyl selenocyanate (4) to furnish phenylthiomethyl isothiocyanate (11), ethyl α-phenylthio-α-isothiocyanoacetate (12) and phenylselenomethyl
β-Keto -δ-valerolactone: synthesis and use as methylvinylketone anion equivalent in michael additions
作者:Jean d'Angelo、Domingo Gomez-Pardo
DOI:10.1016/0040-4039(91)80689-4
日期:1991.6
β-Keto-δ-valerolactone 11 was prepared from 3-butyn-l-ol 6 in 5 steps (50 % overall yield). This lactone was added to Michael acceptors 13, 17, 19 and 25, giving adducts 14, 18, 20 and 26 respectively.
Synthesis of α-phenylseleno-α,β-unsaturated esters by Wittig-type reactions. Studies on the Diels–Alder reaction
作者:Claudio C. Silveira、Marta R.S. Nunes、Elson Wendling、Antonio L. Braga
DOI:10.1016/s0022-328x(00)00685-9
日期:2001.3
anion and ethoxycarbonyl(phenylselenenyl)methylidene(triphenyl)phosphorane with aliphatic and aromaticaldehydes. The α-phenylseleno unsaturated esters were obtained as mixtures of E/Z-isomers in medium to good yields and in moderate yields, respectively. α-Phenylselenenyl acrylate was used as dienophile in a Diels–Alder reaction. On reaction with isoprene only the para isomer was obtained while reaction