3-Methylsulfonylaminophenylboronic acid → N-[3-(2,8-Dimethoxy-10,11-dihydro-dibenzo[a,d]cyclohepten-5-ylidenemethyl)-phenyl]-methanesulfonamide

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Following procedures essentially as described in Example 219, below, and using 3-methanesulfonamidophenyl boronic acid (473 mg, 2.2 mmol) with 5-bromomethylene-2,8-dimethoxy-10,11-dihydro-5H-dibenzo[a,d]cycloheptene (690 mg, 2 mmol) to give 1.3 g crude product. Purify the crude product using column chromatography eluting with 10% EtOAc/hexane to 30% EtOAc/hexane to give 340 mg (39%) product as a pale yellow solid, mp 109.6° C. MS (ES) 436 (M+1), 434 (M−1). HPLC shows 91% purity at t=3.11 min.

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