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Wrap it up and put on a bow! The reaction of N-cinnamoyl-1,3-oxazoline-2-thione with aromatic aldehydes in the presence of BF3⋅Et2O diastereoselectively gave adducts 1, which contain three consecutive asymmetric centers and a chiral bridgehead bound to four heteroatoms.
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Kataoka et al. (2003) studied this question.
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