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. Author manuscript; available in PMC: 2014 Mar 27.
Published in final edited form as: J Am Chem Soc. 2013 Mar 15;135(12):4652–4655. doi: 10.1021/ja400350c

Table 1.

Catalyst Screening for Transannulation with Phenyl Isocyanatea

graphic file with name nihms-457195-t0004.jpg

L= Oct Piv PTV PTTL NTTL NTV
R = p-Tol (1a) <5% 35% 55% 51% 14% 59%
R = Me (1b) - 53% 56% 89% 95% 86%
a

Performed on 0.2 mmol scale; NMR yields are shown.