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. Author manuscript; available in PMC: 2013 May 10.
Published in final edited form as: Heterocycles. 2011 Oct 28;84(2):1193–1207. doi: 10.3987/COM-11-S(P)101

Table 2.

Formal retro-[1,3]/[1,3]-dipolar cycloaddition

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Entry Conditions Result
1. 9 + 6, 90 °C sealed tube 1.5 days 9 + 5
2. 9 + 6, 160 °C sealed tube 12 h 9 + trace 5
3. 9 + 6, 190 °C sealed tube 12 h 9 + 5
1 : 1
4. 9 + 6, 220 °C sealed tube 12 h 28% 5