An efficient method has been developed for the synthesis of 2,3-dihydropyrans and 4-methylenetetrahydropyrans from aldehydes and substituted homoallyl alcohols in benzene mediated by boron trifluoride etherate in good yields. The reaction proceeds viaoxonium–ene reaction.
已开发出一种有效的方法,用于从醛和取代的烯丙基醇中合成2,3-二氢
吡喃和4-亚甲基
四氢吡喃。 苯 由...介导
三氟化硼醚化物丰产。该反应通过-烯反应进行。