反应详情

(S)-α-[[(1,1-Dimethylethoxy)carbonyl]amino]-N-methoxy-N -methylcyclohexanepropanamide (55.3 g., 175.9 mmole, 1 eq.) was dissolved in diethyl ether (1760 ml., 0.1M) and cooled in an ice bath. A solution of lithium aluminum hydride in tetrahydrofuran (193 ml., 193 mmole, 1.1 eq., 1M in tetrahydrofuran) was added dropwise over 90 minutes. After 75 minutes, a 1N HCl solution (1 l.) was added cautiously and slowly. The cooling bath was removed and the mixture was stirred for 2 hours. The layers were separated and the aqueous layer was reextracted with ether (2×400 ml.). The combined ether layers were dried (MgSO4) and freed of solvent in vacuo leaving a viscous oil (46.47 g.). This was chromatographed on silica gel (500 g., Merck) which was packed in hexane. The aldehyde was eluted with ether:hexane (1:1) to give (S)-α-[[(1,1dimethylethoxy)carbonyl]amino]cyclohexanepropanal.

1. temperaturecooled in an ice bath
2. customThe cooling bath was removed
3. customThe layers were separated
4. dry with materialThe combined ether layers were dried (MgSO4)
5. customleaving a viscous oil (46.47 g.)
6. customThis was chromatographed on silica gel (500 g., Merck) which
7. washThe aldehyde was eluted with ether:hexane (1:1)