ASYMMETRIC DIELS-ALDER REACTIONS CATALYZED BY CHIRAL OXAZABOROLIDINES - EFFECT OF THE POSITION OF AN ELECTRON-DONOR FUNCTIONALITY IN THE ALPHA-SIDE CHAIN SUBSTITUENT ON THE ENANTIOSELECTIVITY
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SEERDEN, JPG
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CATHOLIC UNIV NIJMEGEN,NSR,CTR MOLEC STRUCT DESIGN & SYNTH,DEPT ORGAN CHEM,6525 ED NIJMEGEN,NETHERLANDSCATHOLIC UNIV NIJMEGEN,NSR,CTR MOLEC STRUCT DESIGN & SYNTH,DEPT ORGAN CHEM,6525 ED NIJMEGEN,NETHERLANDS
SEERDEN, JPG
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SCHEEREN, HW
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CATHOLIC UNIV NIJMEGEN,NSR,CTR MOLEC STRUCT DESIGN & SYNTH,DEPT ORGAN CHEM,6525 ED NIJMEGEN,NETHERLANDSCATHOLIC UNIV NIJMEGEN,NSR,CTR MOLEC STRUCT DESIGN & SYNTH,DEPT ORGAN CHEM,6525 ED NIJMEGEN,NETHERLANDS
SCHEEREN, HW
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[1] CATHOLIC UNIV NIJMEGEN,NSR,CTR MOLEC STRUCT DESIGN & SYNTH,DEPT ORGAN CHEM,6525 ED NIJMEGEN,NETHERLANDS
Asymmetric Diels-Alder reactions of cyclopentadiene with methacrolein and 2-bromoacrolein catalyzed by chiral oxazaborolidines 1 derived from N-tosyl-L-alpha-amino acids afforded cycloadducts in quantitative yield. Variation in the position of an electron donor atom in the alpha-side chain substituent shows that enantioselectivity is controlled by the presence of electron donor atoms in position 2 and 4.