Investigation on the reactions of<i>o</i>-hydroxybenzyl alcohols with vinyl ethers under acidic and/or thermal conditions
作者:Volkan Kumbaraci、Duygu Ergunes、Melike Midilli、Seckin Begen、Naciye Talinli
DOI:10.1002/jhet.74
日期:2009.3
presence of acid catalyst, reactions yielded regular protection products. However, butyl vinyl ether and 4-methoxy-3-butenone could not give intermolecular cycloaddition reactions under the acidic conditions, because both decomposed to the new products with acids. Hetero-Diels–Alder products obtained only under thermal conditions but in low yields. J. Heterocyclic Chem., 46, 226 (2009).
研究了乙烯基醚与邻羟基苄醇在不同反应条件下的反应。这种尝试的目的是找出是否保护反应或醌甲基化物的杂Diels-Alder反应在原位从产生邻羟基苄醇更可能发生。在高温下,邻羟基苄醇可与二氢-2 H-吡喃产生杂Diels-Alder反应,但仅在与酸催化剂一起使用时才可发生。在室温下,即使在酸催化剂的存在下,反应也会产生常规的保护产物。但是,丁基乙烯基醚和4-甲氧基-3-丁烯酮在酸性条件下不能发生分子间的环加成反应,因为它们都被酸分解为新产物。Hetero-Diels–Alder产品仅在热条件下才能获得,但收率低。杂环化学杂志,46,226(2009)。