Allylstannation of α-, β- and γ-diketones mediated by allylbutyltin halides: Bu2(CH2=CHCH2) SnCl and Bu(CH2 =CHCH2) SnCl2
作者:Daniele Marton、Diego Stivanello、Giuseppe Tagliavini
DOI:10.1016/s0022-328x(97)00083-1
日期:1997.8
Butane-2,3- (la), pentane-2,4- (Ib) and hexane-2,5-dione (Ic) react with Bu-2(CH2=CHCH2)SnCl in the presence of water to give monoallylated keto-ols (2a, 2b) and/or diallylated diols (3a, 3b, 3c), this depending upon the employed molar ratio [diketone]/[allyltin chloride]. Bu(CH2=CHCH2)SnCl2 reacts with neat Ic in a one-pot synthesis to give mixtures of heterocyclic compounds: 2,5-diallyl-2,5-dimethyltetrahydrofuran (4), and 3-chloro-1,5-dimethyl-8-oxabicyclo [3,2,1] octane (5). Compound 4 is also obtained in high yield from the corresponding diol 3c by cyclodehydration promoted by RSnCl3 (R = Me and Bu). (C) 1997 Elsevier Science S.A.