Acid-catalyzed highly diastereoselective and effective synthesis of 1,3-disubstituted tetrahydropyrano[3,4- b ]indoles
作者:Pei Wang、Jia-Zhen Zhao、Hong-Feng Li、Xiang-Ming Liang、Ya-Lun Zhang、Chao-Shan Da
DOI:10.1016/j.tetlet.2016.11.110
日期:2017.1
and diastereoselectivity (>20:1). The secondary tryptophols were synthesized from indole-3-acetic acid. The one-pot synthesis of tetrahydropyrano[3,4-b]indoles was successfully developed from secondary tryptophols and in situ prepared acetals from aldehydes and trimethylorthoformate and thus the cost-efficiency of the protocol was effectively enhanced. Finally, the catalytic asymmetric synthesis of
我们首次成功地探索了三氟乙酸(TFA)可以有效催化次要色酚和缩醛的oxa-Pictet-Spengler反应,以合成1,3-二取代的1,3,4,9-四氢吡喃[3,4- b吲哚类化合物的产率高(高达> 99%)和非对映选择性(> 20:1)。由吲哚-3-乙酸合成仲三酚。由二级p酚和由醛和原甲酸三甲酯原位制备的缩醛成功开发了一锅合成四氢吡喃并[3,4- b ]吲哚,从而有效地提高了该方案的成本效率。最后,催化不对称合成1,3-二取代的四氢吡喃[3,4- b在高度对映体纯的次要三甲基酚的对映选择性实现后,也证明了]吲哚。