All articles of this category The additions of 2-(trimethylsiloxy)furan (5) and 2-( tert -butyldimethylsiloxy) -3-methylfuran (6) to the cyclic N -acyliminium ion generated upon treatment of 1-benzyloxycarbonyl-2-ethoxypyrrolidine (7) with diethyl ether-boron trifluoride complex afforded mixtures of adducts threo - 8 / erythro - 8 and threo - 9 / erythro - 9 , respectively, in which the threo diastereoisomers dominated by ratios of 8.5-6:1.
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Martin et al. (1992) studied this question.