Sodium triacetoxyborohydride → 4-(2-Chloro-4-morpholin-4-yl-thieno[3,2-d]pyrimidin-6-ylmethyl)-1-oxa-4,9-diaza-spiro[5.5]undecane-9-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To a suspension of 2-chloro-4-morpholin-4-yl-thieno[3,2-d]pyrimidine-6-carbaldehyde (100 mg, 0.352 mmol) in dichloroethane (10 mL) were added 1-oxa-4,9-diaza-spiro[5.5]undecane-9-carboxylic acid tert-butyl ester (110 mg, 0.376 mmol) and sodium triacetoxyborohydride (113 mg, 0.533 mmol) and the resulting solution stirred at RT for 3 h. The reaction was quenched with water and loaded onto an Isolute® SCX-2 cartridge, washed with MeOH then eluted with 2 M NH3 in MeOH. The resulting residue was then purified by column chromatography to give the title compound as a white solid (98 mg, 53%) [M+H]+ 524.3

Provenance & Evidence