Complete assignments of the 1H, 13C and 29Si NMRdata of 1-, 4- and 5-trimehylsilyl-, 1,4- and 1,5-bis(trimethylsilyl)- and 1,4,5-tris(trimethylsilyl)-indoles allowed unambiguous confirmation of the structures proposed for these products. For the trisilated derivative it was found that silylation had occurred at the 1,4,5 and not at the 1,4,7 positions as previously suggested.
1-,4-和5-三甲基甲硅烷基-,1,4-和1,5-双(三甲基甲硅烷基)-和1,4,5-三(三甲基甲硅烷基)的1 H,13 C和29 Si NMR数据的完整分配)吲哚允许对这些产品的结构进行明确确认。对于三甲硅烷基化衍生物,发现甲硅烷基化发生在1,4,5处,而不是如先前所建议的1,4,7处。
The direct C-4 substitution of indole; an X-ray crystal structure analysis of 4-(trimethylsilyl)indole
作者:Anthony G. M. Barrett、Daniel Dauzonee、David J. Williams
DOI:10.1039/c39820000636
日期:——
Indole was converted into the 1,4-diacetyl and 1-acetyl-4-(3-chloropropanoyl) derivatives by direct C-4 electrophilic substitution via 4-(trimethylsilyl)indole (3c); the structure of (3c) was confirmed by a single crystal X-ray analysis.