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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Chem Sci. 2011 Jun 24;2(9):1706–1709. doi: 10.1039/C1SC00290B

Scheme 3.

Scheme 3

(j) phenylhydrazine, 12, ZnCl2, THF, 105 °C, 18 h; 76%. (k) PhSO2Cl (3.0 equiv), KOH (5.0 equiv), THF, 0 °C to rt, 18 h; 68%. (l) NBS, AIBN, CCl4, 75 °C, 18 h. (m) P(OEt)3 55 °C, 48 h; 77%.