期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 30, 页码 12527-12533出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202003029
关键词
diazoalkanes; electrophiles; kinetics; nucleophiles; organocatalysis
资金
- National Natural Science Foundation of China [21672124, 21602116, 21772098, 91745101]
- Tsinghua University Initiative Scientific Research Program [20131080083, 20141081295]
- Fonds der Chemischen Industrie (Kekule fellowship)
The kinetics and stereochemistry of the reactions of iminium ions derived from cinnamaldehydes and MacMillan's imidazolidinones with diphenyldiazomethane and aryldiazomethanes were investigated experimentally and with DFT calculations. The reactions of diphenyldiazomethane with iminium ions derived from MacMillan's second-generation catalysts gave 3-aryl-2,2-diphenylcyclopropanecarbaldehydes with yields >90 % and enantiomeric ratios of >= 90:10. Predominantly 2:1 products were obtained from the corresponding reactions with monoaryldiazomethanes. The measured rate constants are in good agreement with the rate constants derived from the one-center nucleophilicity parameters N and s(N) of diazomethanes and the one-center electrophilicity parameters E of iminium ions as well as with quantum chemically calculated activation energies.
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