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. Author manuscript; available in PMC: 2009 Nov 21.
Published in final edited form as: J Org Chem. 2008 Oct 21;73(22):9027–9032. doi: 10.1021/jo8018895

Scheme 3.

Scheme 3

Indazoles synthesis

Reagents and conditions: (i) 2-nitrobenzenesulfonyl chloride, lutidine, DCM, 16h; (ii) bromoketone or bromoacetate, DIEA, DMF, 16h; (iii) DBU, DMF, 30 min; (iv) 50% TFA in DCM, 30 min; (v) mesyl chloride, TEA, DCM, 16h.