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. Author manuscript; available in PMC: 2012 Jun 3.
Published in final edited form as: J Org Chem. 2011 May 4;76(11):4721–4727. doi: 10.1021/jo200425m

Table 2.

Ratios of β (9) and δ (10) carbolines

entry R Yielda (9 : 10)
1 Me 81 % (1.2 : 1) graphic file with name nihms294138t1.jpg
2 Et 85 % (1.25 : 1)
3 i-Pr 90 % (1.8 : 1)
4 n-Bu 87 % (1.35 : 1)
5 i-Bu 93 % (1.4 : 1)
6 t-Bu 85 % (1.9 : 1)
7 Bn 87 % (1.5 : 1)
a

Combined isolated yield