4-Chlorobenzaldehyde → (3S,4S)-4-(tert-butyldimethylsilyloxy)-1-[2-(4-chlorophenyl)-7-benzoxazolyl]pentan-3-ol

Participants

Reaction Steps

A mixture of (3S,4S)-1-(3-amino-2-hydroxyphenyl)-4-(tert-butyldimethylsilyloxy)pentan-3-ol (P0016; 445 mg) and 4-chlorobenzaldehyde (192 mg) in toluene (15 ml) was refluxed for 2 hours. And then to the resulting mixture of the Schiffs base was added manganese triacetate (733 mg) and the reaction mixture was refluxed for 1 hour. The precipitated manganese diacetate was then separated by filtration and the solvent was removed under reduced pressure. The crude product was purified by silica gel (26 g) column chromatography eluting with hexane/ethyl acetate (20:1) to give (3S,4S)-4-(tert-butyldimethylsilyloxy)-1-[2-(4-chlorophenyl)-7-benzoxazolyl]pentan-3-ol (P0012; 465 mg).

Provenance & Evidence