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. Author manuscript; available in PMC: 2010 Jul 15.
Published in final edited form as: J Am Chem Soc. 2009 Jul 15;131(27):9482–9483. doi: 10.1021/ja902526k

Scheme 1.

Scheme 1

Syntheses of 5 and 7: (i) n-BuLi, ether, paraform, reflux, 85% (ii) Br2, PPh3, benzene, reflux, 78% (iii) PhSeSePh, NaBH4, ethanol, reflux, 72% (iv) Pd(CH3CN)4[BF4]2, CH3CN, reflux, then (nBu)4NCl (2 eq.), 76%. (v) MeLi, ether, then ClCH2SPh, 66% (vi) same as (iv), 71%.