Treatment of methyl 2-[6-substituted-3(Z)-hexen-1,5 -diynyl]benzoates (1) with five mol% of palladium chloride and three equivalents of cupric chloride in refluxing acetonitrile gave dibenzo[b,d ]pyran-6-ones (2) in modest to good yields.
用 5 mol% 的
氯化钯和 3 当量的
氯化
铜在回流的
乙腈中处理 2-[6-取代的-3(Z)-hexen-1,5-diynyl]benzoate (1) 得到二苯并[b,d] pyran-6-ones (2) 产率适中。