Abstract trans‐ and cis‐3‐Vinyltetrahydropyran‐4‐ol (11) and (12) as well as derivatives of trans‐ and cis‐3‐vinyl‐4‐piperidinol (25) and (33) were synthesized by essentially stereospecific intramolecular allylboration reactions: The (Z)‐allylboronates 15 and 32 were converted into the cis‐disubstituted heterocycles the (E)‐allylboronates 9 and 23 into the trans‐disubstituted heterocycles.
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Hoffmann et al. (1996) studied this question.
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