tert-Butyl 4-oxopiperidine-1-carboxylate → 4-(2-Chloro-4-morpholin-4-yl-thieno[3,2-d]pyrimidin-6-ylmethylene)-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To a suspension of (2-chloro-4-morpholin-4-yl-thieno[3,2-d]pyrimidin-6-ylmethyl)-phosphonic acid dimethyl ester (0.80 gm) in THF (10 mL) at −78° C. was added dropwise lithium diisopropylamide (1.17 mL of a 2.0 M solution in THF/heptane/ethylbenzene). The mixture was warmed to room temperature and a solution of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester (0.48 g) in THF (10 mL) was added via cannula. The mixture was then stirred at room temperature for 2 h, quenched with brine (20 mL) and extracted into dichloromethane (2×20 mL). The combined organics were dried (MgSO4), reduced in vacuo and purified by column chromatography to give 4-(2-chloro-4-morpholin-4-yl-thieno[3,2-d]pyrimidin-6-ylmethylene)-piperidine-1-carboxylic acid tert-butyl ester as a yellow oil (0.862 g).

Provenance & Evidence