Réaction #80558

Équation de réaction

(R)-3-(N-cyclopentylamino)-8-fluoro-5-methoxy-3,4-dihydro-2H-1-benzopyran

propanal

NaCNBH3

→

desired compound

Rendement 97.0%

(R)-3-(N-Cyclopentyl-N-n-propylamino)-8-fluoro-5-methoxy-3,4-dihydro-2H-1-benzopyran

Rendement 97.0%

Solvants

methanol

Conditions de réaction

Traitement

1. 1
   workup.ADDITIONadded

Mode opératoire

To the solution of (R)-3-(N-cyclopentylamino)-8-fluoro-5-methoxy-3,4-dihydro-2H-1-benzopyran in methanol (25mL) were propanal (2 g, 36 mmol) and NaCNBH3 (2 g, 40 mmol) added. The solution was stirred overnight to give the desired compound in a 97% yield according to GC. The solvent was removed in vacuo and the residue was worked up by extraction to give 3.7 g of the title compound as a colorless oil. GC/MS (70 eV) M=307 (40% ).

Source