Improved preparation of acetals of myo-inositol and its (±)-1-benzyl ether: conformational analysis of di-O-isopropylidene-myo-inositol derivatives
作者:Roberto Fernandez de la Pradilla、Carlos Jaramillo、Jesus Jimenez-Barbero、Manuel Martin-Lomas、Soledad Penades、Amparo Zapata
DOI:10.1016/0008-6215(90)84052-v
日期:1990.10
myo -inositol with 3–5 equiv. of 2-methoxypropene or 2,2-dimethoxypropane in methyl sulfoxide or N,N -dimethylformamide gave mixtures of the 1,2:4,5-, 1,2:5,6-, and 1,2:3,4-di- O -isopropylidene derivatives with little or none of the 1,2:3,4:5,6-triacetal 5 . With ≈ 7 equiv. of 2-methoxypropene in methyl sulfoxide-hexane, 70% of 5 was obtained. Kinetic acetonation of 1- O -benzyl- myo -inositol gave
摘要肌醇与3-5当量的酸催化反应。将2-甲氧基丙烯或2,2-二甲氧基丙烷在甲基亚砜或N,N-二甲基甲酰胺中得到1,2,4,5-,1,2:5,6-和1,2:3,4-的混合物几乎没有或没有1,2:3,4:5,6-三缩醛5的二-O-异亚丙基衍生物。≈7当量 在甲基亚砜-己烷中得到2-甲氧基丙烯,得到5的70%。1-O-苄基-肌醇的动力学丙酮化主要产生3,4:5,6-二缩醛,而热力学条件主要产生2,3:5,6-二缩醛。1-O-苄基-2,3:4,5-二-O-异亚丙基-肌醇是次要产品,主要存在于非极性溶剂的椅子构型和极性偏斜的船形结构中。溶剂,而6-乙酸盐仅采用斜舟构象。