Skip to main content
. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: RSC Adv. 2014 Jun 1;4(37):19072–19076. doi: 10.1039/C4RA02786H

Scheme 2.

Scheme 2

(i) nBuLi, Et2O at −78 °C, room temperature; (ii) ethyl 2,2-diethoxyacetate at −78 °C, room temperature (31%); (iii) phenyl-1,3-dithiolane-2-thione at 130 °C (58%); (iv) Na2SO3, DMSO; (v) 150 °C, Na2SO3, DMSO (24%); (vi) 120 °C, 2-mercaptoethanol, DMSO (31%) (vii) CF3COOH, DMF at 60 °C (82%).