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. Author manuscript; available in PMC: 2014 Jun 24.
Published in final edited form as: Tetrahedron. 2013 Apr 15;69(25):5205–5220. doi: 10.1016/j.tet.2013.04.041

Table 2.

Bromonium-initiated cyclization studies using diepoxide model systems.

Substrate Product Yield (%)a
NBS Br(coll)2ClO4
graphic file with name nihms470242t1.jpg graphic file with name nihms470242t2.jpg 73 61
graphic file with name nihms470242t3.jpg graphic file with name nihms470242t4.jpg 66 65
graphic file with name nihms470242t5.jpg graphic file with name nihms470242t6.jpg 58 52
a

Isolated as a 1:1 mixture of diastereomers in all cases.