作者:Michel Loriot、Jean-Pierre Robin、Eric Brown
DOI:10.1016/s0040-4020(01)83505-5
日期:1984.1
2-Benzyloxypiperonal 15, a key intermediate in our synthesis of (±)- iso - β - peltatin 7, was obtained by bromination of 4 - hydroxy - 1,3 - benzodioxole 12, followed by treatment with (i) excess n-BuLi,o li]N-methylformanilide, li]HCl/H2O, and li]benzyl chloride/K2CO3. The aromatic aldehydes 15 and 6 were subsequently transformed into the corresponding β - (2 - alkoxy 3,4 - methylenedioxybenzyl)
2- Benzyloxypiperonal 15,在我们的(±)的合成中的关键中间体-异- β - peltatin 7羟基- - ,被4溴化得到1,3 -苯并12与(i)过量的正丁基锂,随后处理,o 1 N]-甲基甲酰苯胺,1HCl / H 2 O和1]苄基氯/ K 2 CO 3。随后将芳族醛15和6分别转化为相应的β-(2-烷氧基3,4-亚甲基二氧基苄基)-γ-丁内酯19和29。3,4,5-三甲氧基苯甲醛与19的α-羟基烷基化20异-β-peltatin - ,随后环化和氢解,得到(±)7以良好的收率。同样,用20和丁香醛21进行29的α-羟烷基化,然后环化,可得到良好的(±)-异-β-角蛋白O-甲基醚5和(±)-异-α-角蛋白O-甲基醚8。, 分别。