T. Takeya et al., REACTIONS OF LIGNAN PRECURSORS, CINNAMYL ALCOHOLS AND CINNAMIC-ACIDS,WITH WEITZ AMINIUM SALT, Chemical and Pharmaceutical Bulletin, 43(11), 1995, pp. 1970-1976
Reaction of a lignans precursor, cinnamyl alcohol (2a), with Weitz' am
inium salt, tris(4-bromopheny)aminium hexachloroantimonate, in THF gav
e cinnamaldehyde (4), a coupling product (5), and a furofuran lignan,
(+/-)-sesamin (6). Similar reactions using related precursors 2b, 3a,
3b gave 7, 8a, 9a, 10a, 11a, and 11b.