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. Author manuscript; available in PMC: 2016 May 2.
Published in final edited form as: Tetrahedron. 2014 Nov 8;71(22):3652–3665. doi: 10.1016/j.tet.2014.11.010

Figure 12.

Figure 12

A. Two ways to access (+)-ambiguine H (5a) from (−)-hapalindole U (4a), as well as the unusual heterolytic stability of the N–B bond in compound 43. B. Boron substituent influencing reaction pathways.