2-(Tri-n-butylstannyl)thiophene → HCID 11733796, compound

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4-(4-Methoxy-benzenesulfonyl)-1-(4-thiophen-2-yl-benzyl)-piperidine-4-carboxylic acid ethyl ester was prepared starting from 1-(4-Bromo-benzyl)-4-(4-methoxy-benzensulfonyl)- piperidine-4-carboxylic acid ethyl ester (3 g, 6.05 mmol) and 2-(tributylstannyl)-thiophene (6.8 g, 18.14 mmol) in the presence of tetrakis palladium (0) in boiling tolune. Yield 1.58 g (52%); brown solid; mp 130° C.; MS: 500 (M+H)+

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