4-hydroperoxy-3,4,5-trimethyl-2,5-cyclohexadien-1-one 、
异丁醛 在
1-(3,5-bis(trifluoromethyl)phenyl)-3-phenylthiourea 、
(Ra)-12-hydroxy-1,10-bis(2,4,6-triisopropylphenyl)-4,5,6,7-tetrahydrodiindeno[1,3,2]dioxaphosphocine 12-oxide 作用下,
以
1,2-二氯乙烷 为溶剂,
以63%的产率得到(3S,4aS,8aR)-3-isopropyl-4a,8,8a-trimethyl-4a,5-dihydrobenzo[e][1,2,4]trioxin-6(8aH)-one