[4+2] Cycloaddition of 1-aminodienes and 2-substituted vinylphosphonates: application to asymmetric synthesis of 3-amino-5-phosphono-1-cyclohexene derivatives
(2003) Tetrahedron — Vol. 59, n° 23, p. 4167-4175 (2003)
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- Abstract
- N-Butadienylsuccinimide (1), iso-propyl N-butadienyl-(S)-pyroglutamate (5) and N-butadienyl-(R)-4-phenyloxazolidin-2-one (6) reacted with vinylphosphonates, vicinally-substituted (2) by electronwithdrawing groups (CO2Me, CN, COMe), to furnish [4+2] cycloadducts (3-4,7-10, and 11-14) in moderate to good yields (40-88%). The reactions were highly selective: regioselectivity of 95-100%, endoselectivity of 75-92% and facial selectivity of 80-95%. The major diastereoisomers were fully characterized by H-1 and C-13 NMR spectroscopy. (C) 2003 Elsevier Science Ltd. All rights reserved.
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Robiette, R., Defacqz, N., Stofferis, J., & Marchand-Brynaert, J. (2003). [4+2] Cycloaddition of 1-aminodienes and 2-substituted vinylphosphonates: application to asymmetric synthesis of 3-amino-5-phosphono-1-cyclohexene derivatives. Tetrahedron, 59(23), 4167-4175. https://doi.org/10.1016/S0040-4020(03)00580-5 (Original work published 2003)