Example 158

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To a solution of compound 671 (0.20 g, 0.349 mmol, 1.0 eq) in DCM (6.0 mL) at r.t. was added TFA (2.0 mL) and the reaction was stirred for 2 h, then diluted with anhydrous toluene and concentrated, this operation was repeated for three times to give the title compound as a yellow oil (165 mg, theoretical yield). ESI m/z calcd for C24H36N5O5 [M+H]+: 474.3, found: 474.3.

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