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. Author manuscript; available in PMC: 2009 Aug 3.
Published in final edited form as: J Am Chem Soc. 2006 Mar 1;128(8):2609–2614. doi: 10.1021/ja057741q

Table 3.

Enyne Cyclizations

graphic file with name nihms-82846-t0004.jpg
entry
(substrate)		 X R1 R2 product, yield (dr, E/Z)
1 (13a) C(CO2Me)2 H H 14a, 70% (E only)
2 (13b) NTs H H 14b, 60% (10:1 E/Z)
3 (13c) O Et H 14c, 36% (>95:5 dr, E only)
4 (13d) O H Et 14d, 25%(>95:5 dr, 9:1 E/Z)