Dihydropyrans have been prepared by the cyclisation of easily accessible propargyl vinyl ethers with (TFP)AuCl/AgBF4 as a catalyst in high yields. These compounds undergo acid-catalysed rearrangement into cyclopentenone derivatives.
二氢
吡喃类化合物可通过以(
TFP)AuCl/
AgBF4为催化剂,将易于获得的炔丙基
乙烯基醚进行环化反应高效制备。这些化合物在酸性催化下可重排为
环戊烯酮衍
生物。