Indium Trichloride-Catalyzed Indium-Mediated Allylation of Dihydropyrans and Dihydrofurans in Water
作者:Shen Qi、Teck-Peng Loh、Song Juan、Zhi-Hao Hua、Shun-Jun Ji
DOI:10.1055/s-2004-820030
日期:——
A one-pot indium trichloride-catalyzed indium-mediated allylation of dihydropyrans and dihyfrofurans has been found to be feasible. This catalytic system afforded the allylated diols in moderate to high yields.
Treatment of tetrahydropyranyl (or tetrahydrofuranyl) ether of allylic alcohol with tributylmanganate provided 7-octene-1,5-diol (or 6-hepten-1,4-diol) in good yields. The reaction of propargylic tetrahydropyranyl ether with tributylmanganate is also described.
Treatment of dodec-6-yne with triallylmanganate in the presence of 1,3,5-trimethylbenzene provides (Z)-dodec-6-ene. An addition of D2O before quenching the reaction affords the corresponding dideuterated alkene. The result suggests the existence of the manganese-alkyne complex as an intermediate. Treatment of methyl propargyl ethers as alkynes with tributylmanganate generates propargylmanganese species. The reaction of non-2-ynyl tetrahydropyran-2-yl ether with tributylmanganate provides tetradec-7-yn-1,5-diol and 6-hexylocta-6,7-dien-1,5-diol. (C) 2003 Elsevier Ltd. All rights reserved.
Tin Mediated Allylation Reactions of Enol Ethers in Water
Under tin-mediated Barbier-type reaction conditions, hydration of enol ethers takes place to form aldehydes that undergo allylation reactions. By using this process, various homoallylic alcohols and 2-halohomoallylic alcohols are produced in good to excellent yields.