Rb. Herbert et al., USE OF IRON(III) CHLORIDE IN THE EFFICIENT PREPARATION OF THE ALKALOID KREYSIGINE BY OXIDATIVE COUPLING, Tetrahedron letters, 36(31), 1995, pp. 5649-5650
Reaction of the isoquinoline (1) with iron (III) chloride in dichlorom
ethane followed by reductive treatment with methanol gives kreysigine
(4) in 71% yield; (2) gives (4) in lower yield as does treatment with
water instead of methanol; (8) is the product of a thallium (III) oxid
ation.