Synthesis of (<i>R</i>)- and (<i>S</i>)-4′-Acetoxyolivetol [(<i>R</i>)- and (<i>S</i>)-5-(4′-Acetoxypentyl)-1, 3-benzenediol]: Key Intermediates in the Synthesis of Tetrahydrocannabinol Derivatives
作者:M. Singer、C. Siegel、P. M. Gordon、A. K. Dutta、R. K. Razdan
DOI:10.1055/s-1994-25509
日期:——
The synthesis of (R)- and (S)-4′-acetoxyolivetols, key intermediates in the synthesis of tetrahydrocannabinol derivatives from 3,5-dihydroxybenzoic acid (4) is described. The 3,5-dihydroxy groups were protected as their tert-butyldimethylsilyl derivatives, and the benzoic acid group was transformed into the benzyl-1,3-dithiane derivative 8. Treatment of the anion of 8 with the chiral 1,2-epoxypropane gave the dithianyl alcohol 9, which after acetylation followed by desulfurization and deprotection of the phenolic hydroxyl groups, furnished the desired 4′-acetoxyolivetols (2a,b) in an overall yield of 13 %.
本研究描述了从 3,5-二羟基苯甲酸(4)合成四氢大麻酚衍生物的关键中间体 (R)- 和 (S)-4′-acetoxyolivetols 的合成过程。3,5-二羟基作为其叔丁基二甲基硅烷衍生物受到保护,苯甲酸基则转化为苄基-1,3-二噻烷衍生物 8。 将 8 的阴离子与手性 1,2-环氧丙烷处理后得到二噻烷醇 9,经过乙酰化、脱硫和酚羟基脱保护后,得到所需的 4′-乙酰氧基橄榄醇 (2a,b),总产率为 13%。