Synthesis of (±)-Glaucine and (±)-Neospirodienonevia an One-PotBischlerNapieralski Reaction and Oxidative Coupling by a Hypervalent Iodine Reagent
作者:Wei-Jan Huang、Om V. Singh、Chung-Hsiung Chen、Shoei-Sheng Lee
DOI:10.1002/hlca.200490005
日期:2004.1
acids, i.e., 4a–e, via a practical and efficient one-pot Bischler–Napieralski reaction, followed by NaBH4 reduction, produced a series of 1-benzyl-1,2,3,4-tetrahydroisoquinolines, i.e., 5a–e, in satisfactory yields (Scheme 3). Oxidative coupling of the N-acyl and N-methyl derivatives 6a–e of the latter with hypervalent iodine ([IPh(CF3COO)2]) yielded products with two different skeletons (Scheme 4). The
3,4- dimethoxybenzeneethanamine(缩合3D)和各种酸苯乙酸,即,图4a - ë,经由一个实用,高效的一锅煮施勒-纳皮耶拉尔斯基反应,随后加入NaBH 4还原,产生了一系列的1-苄基1, 2,3,4-四氢异喹啉,即,图5a - ê,在令人满意的产率(方案3)。后者的N-酰基和N-甲基衍生物6a – e与高价碘([IPh(CF 3 COO)2 ])产生具有两个不同骨架的产物(方案4)。N-酰基衍生物6a - c的主要产物为(±)-N-酰基亚螺二酮2a - c,次要产物为3,4-二氢异喹啉7。然而,(±)-甘氨酸(1)是从N-甲基衍生物6e开始的主要产物。提出了用于形成这两种类型骨架的可能的反应机理(方案5)。