Scheme 3.
Reagents: i: BF3·Et2O (1 eq), MeOH 95%; ii: substituted benzaldehydes, BF3·Et2O (1 eq), DCM; iii: substituted benzaldehydes, BF3·Et2O (2 eq), DCM; see Table 1 for cis/trans ratios and yields.
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