4-(4-methoxybenzyl)-4-methyltetrahydro-2H-pyran-3-carboxylic acid 在
polyphosphoric acid 作用下,
反应 0.67h,
生成 8-methoxy-4a-methyl-3,4,4a,5-tetrahydro-1H-benzo[g]isochromen-10(10aH)-one 、 cis-8-methoxy-4a-methyl-3,4,4a,5-tetrahydro-1H-benzo[g]isochromen-10(10aH)-one