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. Author manuscript; available in PMC: 2011 May 7.
Published in final edited form as: Org Biomol Chem. 2010 Mar 16;8(9):2252–2259. doi: 10.1039/c001307b

Table 1.

Optimization of G-1 Synthesis

Entry Methoda,b Solvent Time(h) Temp(°C) Yield(%) endo/exo
1 A, B MeCN 2 rt 98 94:6
2 A MeCN 3 0 40 94:6
3 B MeCN 3 0 98 97:3
4 A, B DCM 2 rt 94 94:6
5 A DCM 4 0 80 95:5
6 B DCM 4 0 95 98:2
a

A:Multicomponent cyclization.

b

B:Stepwise imineformation, cyclization