Stereoselective Hydride Reductions of Cyclic N-Diphenylphosphinyl Imines. Highly Diastereoselective Syntheses of Protected Primary Amines
摘要:
Reduction of N-diphenylphosphinyl imines of variously substituted cyclohexanones, cyclopentanones, and bicyclic ketones with lithium tri-sec-butylborohydride provides highly diastereoselective procedures for the syntheses of N-diphenylphosphinyl amines which represent protected primary amines that can be unmasked by mild acidic cleavage. Attack of cyclohexyl derivatives occurs almost exclusively via equatorial approach to yield axial amine derivatives while cyclopentyl and bicyclic imines are attacked from the less sterically encumbered faces.
Provided herein are compounds of the formula (1):
as well as pharmaceutically acceptable salts thereof, wherein the substituents are as those disclosed in the specification. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment of diseases such as, for example, type II diabetes mellitus and metabolic syndrome.
HUTCHINS, R. O.;SU, WEI-YANG;SIVAKUMAR, R.;CISTONE, F.;STERCHO, Y. P., J. ORG. CHEM., 1983, 48, N 20, 3412-3422
作者:HUTCHINS, R. O.、SU, WEI-YANG、SIVAKUMAR, R.、CISTONE, F.、STERCHO, Y. P.
DOI:——
日期:——
Stereoselective Hydride Reductions of Cyclic N-Diphenylphosphinyl Imines. Highly Diastereoselective Syntheses of Protected Primary Amines
作者:Robert O. Hutchins、Jeffrey Adams、Melvin C. Rutledge
DOI:10.1021/jo00128a009
日期:1995.11
Reduction of N-diphenylphosphinyl imines of variously substituted cyclohexanones, cyclopentanones, and bicyclic ketones with lithium tri-sec-butylborohydride provides highly diastereoselective procedures for the syntheses of N-diphenylphosphinyl amines which represent protected primary amines that can be unmasked by mild acidic cleavage. Attack of cyclohexyl derivatives occurs almost exclusively via equatorial approach to yield axial amine derivatives while cyclopentyl and bicyclic imines are attacked from the less sterically encumbered faces.