A direct synthesis of 1,7-dioxaspiro[4.5]decanes from the new 3-methylidenepentane-1,5-dianion synthon
作者:Francisco Alonso、Jaisiel Meléndez、Tatiana Soler、Miguel Yus
DOI:10.1016/j.tet.2005.12.008
日期:2006.3
carbonyl compound in THF at 0 °C, leads, after hydrolysis, to the expected methylidenic diols 3 . These diols undergo double intramolecular iodoetherification promoted by a silver salt, to furnish the corresponding 1,7-dioxaspiro[4.5]decanes ( 4 ) in very high yields. The oxidation of compounds 4 to the corresponding lactones is also studied.
摘要 4-Phenylsulfanyl-2-(2-phenylsulfanylethyl)but-1-ene ( 2 ) 已被证明是一种合适的新型3-亚甲基戊烷-1,5-双阴离子合成子。2 与过量的锂粉和催化量的 DTBB (2.5%) 在羰基化合物的存在下在 THF 中在 0°C 的反应,在水解后导致预期的亚甲基二醇 3 。这些二醇经历由银盐促进的双分子内碘醚化,以非常高的产率提供相应的 1,7-二恶螺[4.5]癸烷 (4)。还研究了化合物 4 氧化成相应的内酯。