Rw. Hoffmann et al., Domino-hydroformylation-allylboration-hydroformylation for the synthesis of trans-2-alkylpiperidin-3-ols, HETEROCYCLE, 52(1), 2000, pp. 121-124
Hydroformylation of an N-allyl-gamma-amidoallylboronate (7d) generates a fo
rmyl function which allows intramolecular allylboration to proceed to give
a vinylpiperidinol (11). The latter is again hydroformylated under the reac
tion conditions to furnish an oxa-aza-decalin ring system (12).