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. 2007 Nov;18(11):2074-80.
doi: 10.1016/j.jasms.2007.09.002. Epub 2007 Sep 8.

Study of Michael-Michael-retro Michael addition catalyzed by 9-amino-9-deoxyepiquinine using ESI-MS

Zhi-Jun Wu  1 , Shi-Wei Luo, Jian-Wu Xie, Xiao-Ying Xu, Dong-Mei Fang, Guo-Lin Zhang
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Study of Michael-Michael-retro Michael addition catalyzed by 9-amino-9-deoxyepiquinine using ESI-MS

Zhi-Jun Wu et al. J Am Soc Mass Spectrom. 2007 Nov.
Free article

Abstract

The Michael-Michael-retro Michael addition catalyzed by 9-amino-9-deoxyepiquinine was monitored and the major intermediates and catalyst in the catalytic cycle were detected and characterized using ESI-MS/MS for the first time. Some important isomeric intermediates including isomeric enamine and imine structures were tentatively differentiated and further studied by theoretical calculations. Fragment ions of protonated catalyst indicate that proton possibly influences the conformation of the catalyst.

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