期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 26, 页码 7425-7429出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201702734
关键词
aminals; betaines; carbon dioxide fixation; organocatalysis; reduction
资金
- National Key Research and Development Program [2016YFA0602900]
- National Natural Science Foundation of China [21472103, 21421001, 21421062]
- Natural Science Foundation of Tianjin [16JCZDJC39900]
An efficient, sustainable organocatalyst, glycine betaine, was developed for the reductive functionalization of CO2 with amines and diphenylsilane. Methylamines and formamides were obtained in high yield by tuning the CO2 pressure and reaction temperature. Based on identification of the key intermediate, that is, the aminal, an alternative mechanism for methylation involving the C-0 silyl acetal and aminal is proposed. Furthermore, reducing the CO2 amount afforded aminals with high yield and selectivity. Therefore, betaine catalysis affords products with a diversified energy content that is, formamides, aminals and methylamines, by hierarchical two-, four- and six-electron reduction, respectively, of CO2 coupled with C-N bond formation.
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