P. Bravo et al., STEREOSELECTIVE TOTAL SYNTHESIS OF ENANTIOMERICALLY PURE 1-TRIFLUOROMETHYL TETRAHYDROISOQUINOLINE ALKALOIDS, EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, (3), 1998, pp. 435-440
Enantiomerically pure 1-trifluoromethyl-tetrahydroisoquinoline alkaloi
d analogues, in which C-1 is a quaternary stereogenic centre, have bee
n synthesized by stereoselective intramolecular Pictet-Spengler reacti
on of the N-arylethyl gamma-trifluoro-beta-iminosulfoxide (R)-3, and s
ubsequent elaborations of the sulfinyl auxiliary. The absolute stereoc
hemistry of the stereogenic centre was determined by X-ray diffraction
on the alpha-phenylpropionic ester (1R,2'S)-10.