Lithium triethylborohydride → (S)-2-(3-aminophenyl)-7-methoxy-8-(3-((S)-7-methoxy-2-(4-methoxyphenyl)-5-oxo-5,11a-dihydro-1H-pyrrolo[2,1-c][1,4]benzodiazepine-8-yloxy)propyloxy)-1H-pyrrolo[2,1-c][1,4]benzodiazepine-5(11aH)-one

A solution of superhydride (0.56 mL, 0.56 mmol, 1.0 M in THF) was added dropwise to a solution of the SEM dilactam (18)(0.271 g, 0.27 mmol) in dry THF (10 mL) at −78° C. under a nitrogen atmosphere. After 1 hr a further aliquot of superhydride solution (0.13 ml, 0.13 mmol) was added and the reaction mixture was allowed to stir for another 0.5 hr, at which time LC-MS indicated that reduction was complete. The reaction mixture was diluted with water and allowed to warm to room temperature. The reaction mixture was partitioned between chloroform and water, the layers were separated and the aqueous layer extracted with additional chloroform (emulsions). Finally the combined organic phase was washed with brine and dried over magnesium sulphate. The reduced product was dissolved in methanol, chloroform and water and allowed to stir in the presence of silica gel for 72 hours The crude product was subjected to flash column chromatography (methanol/chloroform gradient) to afford the desired imine product (150 mg, 0.21 mmol, 77%) after removal of excess eluent from selected fractions.

1. customThe reaction mixture was partitioned between chloroform and water
2. customthe layers were separated
3. extractionthe aqueous layer extracted with additional chloroform (emulsions)
4. washFinally the combined organic phase was washed with brine
5. dry with materialdried over magnesium sulphate
6. dissolutionThe reduced product was dissolved in methanol
7. stirringto stir in the presence of silica gel for 72 hours The crude product

ORD record

ord-3d4058016dbb4e638dc6baa6956fe06f

Source dataset

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08592576B2