中文摘要 在本研究中,我們先以異香草醛(Isovanillin)(1) 為最初起始原料,和3-溴丙烯(allyl bromide)以無水丙酮當溶媒,在無水K2CO3存在下迴流反應,得到2—丙烯氧基異香草醛(2—allyloxyisovanillin)(2),將化合物 2在高溫(180℃)進行克雷森轉位重排反應(Claisen rearrangement)後,得到產物2—丙烯基—3—羥基—4—甲氧基苯甲醛(2—allyl—3—hydroxy—4—methoxybenzaldehyde) (3) ,將化合物3 上的烴基進行各種烷基化反應及NaBH4還原反應,得醇類化合物 5,然後再用強鹼、KOBut在無水THF溶媒下,進行分子內sp2-endo trigonal環化反應(sp2-endo trigonal intramolecular cyclization)而得到isochoman 類的化合物6。
英文摘要 In this study, 2-allyloxyisovanillin ( 2 ), prepared from isovanillin ( 1 ), was heated at higher temperature ( 180 ℃) to undergo the Claisen rearrangement to furnish 2-allyl-3-hydroxy-4-methoxybenzaldehyde ( 3 ). Based on O-alkylation and reduction ,compound 3 was converted into 3-alkyloxy-2-allyl-4-methoxybenzyl alcohol ( 5 ) in good yields. Followed by the treatment of compound 5 with potassium tert-butoxide to undergo the isomerization of the allylic double bond, and concomitantly to undergo the sp2-endo trigonal intramolecular cyclization, gave a series of new substituted isochromans in moderate yields.