Ethyl Acetate → tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-methanesulfonylamino-propionate

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Reaction Steps

To a mixture of tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-amino-propionate (1.02 g, 2.0 mmol), with trimethylsilyl cyanide (0.7 ml, 5.2 mmol) in dry acetonitrile (15 ml) was added methanesulfonyl chloride (0.18 ml, 2.3 mmol) and the material was stirred overnight. Ethyl acetate (80 ml) was added and the material was partitioned with aqueous hydrochloric acid (1.5%, 80 ml). The organic phase was collected and washed with an equal volume of brine; The aqueous phases were back extracted with ethyl acetate (2×80 ml) and the organic phases combined, dried (MgSO4), filtered and condensed to provide tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-methanesulfonylamino-propionate as a pale yellow semi-viscous oil (1.4 g).

Provenance & Evidence