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. Author manuscript; available in PMC: 2013 Jun 27.
Published in final edited form as: J Am Chem Soc. 2012 Jun 18;134(25):10659–10663. doi: 10.1021/ja303876e

Table 4.

Diels-Alder Competition Studies.

graphic file with name nihms-387030-t0025.jpg
entry −EWG yield (12a) yield (13)
1 −CO2Me 68% 0%
2 −CO2H 63% 0%
3 −CONHCyc 68% 0%
4 −CHO 65% 5%
5 graphic file with name nihms-387030-t0026.jpg 40% 40%
a

Key: (a) 2.5 eq. Et2AlCl, 1 eq. cyclohexadiene, CH2Cl2, 3h, 0 °C→rt.