A. Srikrishna et al., REDUCTION OF QUINOLINES TO 1,2,3,4-TETRAHYDRO DERIVATIVES EMPLOYING ACOMBINATION OF NACNBH3 AND BF3.OET(2), Tetrahedron, 52(5), 1996, pp. 1631-1636
A regiospecific reduction of quinolines (and 1,10-phenanthroline) into
the corresponding 1,2,3,4-tetrahydro derivatives using a combination
of sodium cyanoborohydride and boron trifluoride etherate in refluxing
methanol is described. Under the same conditions indole and acridine
reduced to the corresponding dihydroderivatives, whereas acyl group tr
ansfer from oxygen to nitrogen atom is also noticed in the case of 8-a
cyloxyquinolines.