The preparation of 4-alkyl (or aryl) tropones has easily been accomplished by the anodic oxidation of 1-methoxy-4-alkyl (or aryl) cycloheptatrienes which were synthesized by the regioselective addition of alkyl or aryl lithium to 3-position of 7,7-dimethoxyeycloheptatriene followed by the thermal 1,5-hydrogen shift of the resulting 3-methoxy-7-alkyl (or aryl) cycloheptatrienes.
Stereo- and regiocontrolled hydroxylation of oxyallyl [4+3] cycloadducts. A concise synthesis of hinokitiol
作者:Jae Chol Lee、Sung Yun Cho、Jin Kun Cha
DOI:10.1016/s0040-4039(99)01589-0
日期:1999.10
Stereo- and regioselective hydroxylation of 8-oxabicyclo[3.2.1]oct-6-en-3-ones was achieved by the action of (diacetoxyiodo)benzene in methanolic potassium hydroxide (the Moriarty oxidation). Subsequent double elimination afforded a convenient preparation of substituted tropolones, as exemplified in a three-step synthesis of hinokitiol (1).