The SnC12-effected reaction of 2 with ethyl vinyl ether and 1-trimethylsilyloxybutadiene afforded 28, &z, and &g.Proso- phylline (A), a racemic alkaloid of Prosopis africana, was first Synthesized by differentiating the double bonds of &x.Prosophylline (&I, prosopinine , isoprosopinine A,(&), isoprosopinine B
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Natsume et al. (1981) studied this question.