Regioselective Synthesis of 2-Arylthio-4-methoxybenzoates by Formal [3+3] Cyclocondensations of 3-Arylthio-1-trimethylsilyloxybuta-1,3-dienes with 3-Oxo-orthoesters - Imran, Muhammad; Iqbal, Inam; Langer, Peter (Synlett, 2009)