600 g using ethyl acetate hexane 2 3 as the eluting solvent in this way there was obtained the starting sulfone 3 0 g 25 and the product 1 2 4 6 dioxo 2 2 dimethyl 1 3 dioxan 5 yl ethyl 2 methanesulfonyl 5 benzoyl pyrrole 7 0 g 35 46 based on starting material consumed recrystallization of the product was effected from aqueous acetone nmr pyridine d 5 1 62 s 3h 3 02 5 2h j 6 8 hz 3 57 s 3h 5 28 5 2h j 6 8 hz 6 58 d 1h j 4 1 hz 7 03 d 1h j 4 1 hz 7 33 7 51 m 3h 7 77 7 94 m 2h calcd for c 20 h 21 no 7 s c 57 28 h 5 05 n 3 34 found c 57 20 h 5 25 n 3 29 b similarly substituting into the procedure of part a for 2 methylsulfonyl 5 benzoylpyrrole the compounds listed in example 6 part b one obtains c similarly substituting into the procedure of part a for 2 methylsulfonyl 5 benzoylpyrrole the compounds listed in example 6 part c one obtains sodium hydride in mineral oil 50 0 060 g 1 2 mmoles was added to a solution of 1 3 3 dimethoxycarbonyl propyl 2 methanesulfonyl 5 benzoyl pyrrole 0 463 g 1 13 mmoles in dry dimethylformamide 25 ml in a nitrogen atmosphere after 0 5 hour at room temperature the solution was heated in an oil bath at 100 u00b0 110 u00b0 for 2 hours the progress of the reaction was followed by tlc ethyl acetate hexane 1 3 on silica gel the solution was cooled to room temperature water 100 ml was added and the solution was.