Diisopropylamine → HCID 53906880, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 0.5 ml of diisopropylamine in 15 ml of THF was treated at 0° C. with 2.0 ml of a solution of 1.6M n-butyllithium in hexane and, after stirring, cooled to -75° C. Then, a solution of 765 mg of N-benzyl-N-phenylglycine methyl ester in 3 ml of THF was added. After stirring a solution of 700 mg of (R)-3-(t-butyl-dimethylsiloxy)tetradecanal (Example Bb)) in 5 ml of THF was added dropwise. After stirring at -75° C. the reaction mixture was poured into aqueous potassium hydrogen sulphate and extracted with ether. The ether phase was dried, concentrated, partitioned between hexane and methanol/water (7:3), the hexane phase was dried and concentrated and the residue was chromatographed on silica gel with pentane/ether (5:1). There were obtained 96.3 mg of methyl (5R)-2-(N-benzylanilino)-5-(t-butyldimethylsiloxy)-3-hydroxyhexadecanoate, diastereomer A, MS: 540 (M+ ·-C4H9 ·), and 142.8 mg of methyl (5R)-2-(N-benzylanilino)-5-(t-butyldimethylsiloxy)-3-hydroxyhexadecanoate, diastereomer B, MS: 540 (M+ ·-C4H9 ·), and 313.4 g of a mixture of the above two diastereomers.

Provenance & Evidence