Lewis Acid. -The process is investigated with different N-protecting groups at the aziridine nitrogen and different Lewis acids. Generally the N-Troc protected derivative (IId) is found to give at least reasonable yields of the desired tryptophan. -(TIROTTA, I.; FIFER, N. L.; EAKINS, J.; HUTTON*, C. A.; Tetrahedron Lett. 54 (2013) 7, 618-620, http://dx.
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