to variously substituted tetrahydroisoquinolines, allows asymmetric C-C bond forming reactions to occur α- to the amino group. In this manner, a wide variety of (S)-1-alkyl-1,2,3,4-tetrahydroisoquinolines were constructed in > 90% enantiomeric excess. Choosing the proper substituents and skeletal features, an efficient entry into the benzylisoquinoline, tetrahydroprotoberberine, aporphine, and isopavine
Reduction of Lactams to Cyclic Tertiary Amines by Sodium Borohydride
作者:Sukhendu B. Mandal、Venkatachalam S. Giri、Satyesh C. Pakrashi
DOI:10.1055/s-1987-28197
日期:——
Sodium borohydride in boiling tert-butyl alcohol/methanol reduces tertiary δ-lactams of the quinolizidine type to the corresponding amines in high yield.