. Author manuscript; available in PMC: 2012 Sep 14.

Published in final edited form as: J Am Chem Soc. 2011 Aug 18;133(36):14443–14451. doi: 10.1021/ja205700p

Table 1.

Cycloadditions of 2_Ph with 2-Substituted Furans in the Absence of ZnCl₂^a

Entry	syn-endo-I	anti-endo-I	anti-endo-II	Yield (%)
1				54
2	–	–	–	60
3	–	–	–	40

Isolated yields. Isomer distributions are given in parentheses, and were determined by ¹H and/or ¹³C NMR.