4-Iodobenzonitrile → (S)-8-[(S)-4-(4-cyano-phenyl)-1 methoxycarbonyl-but-3-ynylcarbamoyl]-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7-carboxylic acid tert-butyl ester

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(S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7,8-dicarboxylic acid 7-tert-butyl ester (59 mg) was coupled with (S)-propargyl-glycinemethylester hydrochloride (20 mg) according to General Procedure A. The resulting (S)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-8-((S)-1-methoxycarbonyl-but-3-ynylcarbamoyl)-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7-carboxylic acid tert-butyl ester (26 mg) was reacted with 4-iodobenzonitrile (7 mg) according to General Procedure S to give (S)-8-[(S)-4-(4-cyano-phenyl)-1 methoxycarbonyl-but-3-ynylcarbamoyl]-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7-carboxylic acid tert-butyl ester (12 mg).

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