Stereospecific synthesis of novel methyl-substituted mono- and di-methoxy conduritols
作者:Latif Kelebekli、Dilek Kaplan
DOI:10.1016/j.tet.2016.11.042
日期:2017.1
Methyl-monomethoxy conduritol-B and methyl-dimethoxy conduritol-B were synthesized starting from 2-methylbenzo-1,4-quinone. Bromination of 2-methylbenzo-1,4-quinone was followed by the reduction of the carbonyl groups with NaBH4 to give a dioldibromo compound. Methyl-dimethoxy conduritol-B was synthesized from the reaction of the dioldibromo compound with CH3ONa, followed by acetylation with Ac2O-pyridine
从2-甲基苯并-1,4-醌开始合成甲基-单甲氧基香豆醇-B和甲基-二甲氧基香豆醇-B。将2-甲基苯并-1,4-醌溴化,然后用NaBH 4还原羰基,得到二醇二溴化合物。由二醇二溴化合物与CH 3 ONa反应,然后用Ac 2 O-吡啶乙酰化,得到甲基-二甲氧基二乙酸二甲酯。另一方面,甲基-二醇二溴化合物的乙酰化,然后与LiOH反应,立体选择性地得到单环氧化物化合物。环氧化物与H + / Ac 2的反应O提供三乙酸一溴。一溴三乙酸酯与CH 3 ONa在MeOH中的受控反应提供了所需的新甲基-单甲氧基Conduritol-B。所有合成化合物的结构均通过光谱法表征。