1-Substituted indol-3-yl and indol-2-yl disubstituted methanols do not undergo acid-catalysed trimerisation to yield indolocyclotriveratrylenes, unlike the related primary 1-substituted indol-3-yl- and -2-ylmethanols. The 1-substituted indol-3-ylmethanols 10 and 11 gave diindol-3-ylmethanes 12 and 13, respectively, on treatment with p-toluenesulfonic acid in dichloromethane. In contrast, the indol-2-ylmethanols 22 and 23 gave the reduced indolo[3,2-b]carbazoles 24 and 25, respectively, on treatment with boron trifluoride etherate in benzene. An X-ray crystal structure of compound 24 is described.
1-取代的吲哚-3-基和吲哚-2-基二取代甲醇不会在酸催化的条件下发生三聚反应,产生吲哚环三聚体,与相关的一次取代的吲哚-3-基和-2-基甲醇不同。1-取代的吲哚-3-基甲醇10和11在二氯甲烷中与对甲苯磺酸处理后分别生成二吲哚-3-基甲烷12和13。相反,吲哚-2-基甲醇22和23在苯中与三氟化硼醚酸处理后分别生成还原的吲哚[3,2-b]咔唑24和25。描述了化合物24的X射线晶体结构。