Reaction of 1,3-dihalo-3-methy]-2-butanone with t-butyl acetoacetate (NaH) gave t-butyl 3,4-dihydro-2,2,6-trimethyl-4-oxo-2H-pyran-5-carboxylate via the Favorskii-type rearrangement. Michael addition of 4-methylphenyllithium (CuI) followed by ring cleavage with Me3 SiCl-NaI in DMF or PrCN afforded ar-atlantone as well as (±)-ar-turmerone selectively.
1,3-二卤-3-甲基] -2-
丁酮与
乙酰乙酸叔丁酯(NaH)反应生成叔丁基3,4-二氢-2,2,6-三甲基-4-氧代-
2H-吡喃-通过Favorskii型重排生成5-
羧酸盐。迈克尔加成4- methylphenyllithium(CUI)的随后用我环切割3在
DMF或PRCN得到的SiCl-的NaI AR -atlantone以及(±) -芳-turmerone选择性。