Stereochemical Studies of Monoterpene Compounds. XII. The Acid-Catalyzed Rearrangements of 2α-Bromo-10β-pinan-3-one
作者:Toshifumi Hirata、Takayuki Suga
DOI:10.1246/bcsj.44.2833
日期:1971.10
of 3-acetoxy-pin-2-ene (II), the acid-catalyzed rearrangement of 2α-bromo-10β-pinan-3-one (I) was investigated under several conditions. The bromoketone (I) was thus found to yield (+)-6-endo-bromocamphor (III), (−)-α-carvone (V), (−)-8-hydroxycarvotanacetone (VI), carvacrol (VII), (+)-dihydro-β-campholenolactone (VIII), and (+)-campholenic acid (IX). It also became clear that the bromocamphor (III)
关于 3-乙酰氧基-pin-2-ene (II) 的溴化,在几种条件下研究了 2α-bromo-10β-pinan-3-one (I) 的酸催化重排。因此发现溴酮(I)产生(+)-6-内-溴樟脑(III)、(-)-α-香芹酮(V)、(-)-8-羟基香芹酮(VI)、香芹酚(VII)、 (+)-二氢-β-樟脑内酯 (VIII) 和 (+)-樟脑酸 (IX)。还清楚的是,溴樟脑 (III) 和 (V)、(VI) 和 (VII) 产物直接由溴酮 (I) 形成,而 γ-内酯 (VIII) 则通过 α-樟脑酸获得(IX) 来自溴樟脑 (III)。讨论了重排的机械意义。