2,4-Dialkoxy-, 2-alkoxy-4-phenoxy-, and 2,4-diphenoxy-6-trifluoromethyl-3,4-dihydro-2H-pyrans are obtained in high yields by the hetero-Diels Alder reaction of trans-β-trifluoroacetylvinyl ethers with various vinyl ethers under mild conditions.
在温和的条件下,反式-δ-三
氟乙酰乙烯基醚与各种
乙烯基醚发生杂化-Diels Alder 反应,可以高产率地获得 2,4-二烷氧基-、2-烷氧基-4-苯氧基-和 2,4-二苯氧基-6-三
氟甲基-
3,4-二氢-2H-吡喃。