Asymmetric oxyselenenylation–deselenenylation reactions of alkenes induced by camphor diselenide and ammonium persulfate. A convenient one-pot synthesis of enantiomerically enriched allylic alcohols and ethers
The reaction of β,γ-unsaturated esters and nitriles with camphor diselenide and ammonium persulfate in methanol, ethylene glycol or water affords enantiomericallyenriched γ-alkoxy or γ-hydroxy α,β-unsaturated derivatives, respectively, in good chemical yields and with moderate to good enantioselectivity.
Enantiomerically pure 2,5,6a-trisubstituted perhydrofuro[2,3-b]furans were obtained by the cyclization of bis-alkenylketones, promoted by camphorselenenyl sulfate produced in situ by oxidation of camphor diselenide with ammonium persulfate in a mixture of water and acetonitrile at room temperature. The cyclization reaction proceeded through a double selenohydroxylation of the two double bonds and produced
对映体纯的2,5,6a-三取代的全氢呋喃[2,3- b ]呋喃是通过双链烯基酮的环化反应得到的,呋喃是由在水和乙腈的混合物中用过硫酸铵氧化樟脑二硒化物而产生的樟脑硒烯基硫酸盐促进的。在室温下。环化反应通过两个双键的双selenohydroxylation进行,并且所产生的非对映异构2的混合物反式-和顺-2,5-双[(camphorseleno)甲基] perhydrofuro [2,3- b ]呋喃。将它们通过中压液相色谱分离,然后用氢化三苯锡和AIBN去硒烯基化。