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. Author manuscript; available in PMC: 2010 Feb 12.
Published in final edited form as: J Am Chem Soc. 2007 Sep 27;129(42):12870. doi: 10.1021/ja074432m

Scheme 4.

Scheme 4

i. 100 mM piperidine, 90ÞC, 15 min; ii. 100 mM DMEDA, 90ÞC, 15 min; iii. 100 mM DMEDA, 37ÞC, 20 min; iv. 100 mM piperidine, 37ÞC, 20 min; v. 50 mM 2-mercaptoethanol, 100 DMEDA, 37ÞC, 20 min; vi. 50 mM 2-mercaptoethanol, 37ÞC, 20 min (yields 19).