F. Roussi et al., 4,4'-DISUBSTITUTED 1,2,3,4-TETRAHYDROISOQUINOLINES FROM ALKYLATION OFA CHIRAL NON RACEMIC LACTAM - AN APPROACH TO THE CRININE-TYPE ALKALOIDS, Tetrahedron, 54(35), 1998, pp. 10363-10378
Enantiomerically pure 4,4-disubstituted tetrahydroisoquinolin-3-ones c
an be easily prepared by bis-alkylation of 1,2,3,4-tetrahyroisoquinoli
n-3-one 1 derived from (R)-(-)-phenylglycinol. The observed diastereos
electivity was explained by a rigid chelated intermediate. The obtaine
d bis-alkylated products were used to prepare the ABC and ABD rings of
the crinine alkaloid skeleton. (C) 1998 Elsevier Science Ltd. All rig
hts reserved.