Rhodium-Catalysed 1,4-Additions in Water: Synthesis of Succinic Esters and β²-Amino Acid Derivatives

Abstract

The rhodium-catalysed addition of boronic acids to α-substituted activated alkenes proceeds smoothly in water resulting in a unique synthesis of both succinic esters and β²-amino acid ­derivatives.

Key words

conjugate addition - rhodium - boronic acids - succinic esters - β²-amino acids

References

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6

All compounds have been satisfactorily characterised by ¹H NMR and ¹³C NMR. ¹H NMR data (300 MHz, CDCl₃) for 3a: δ = 2.34 (1 H, dd, J = 4.8, 16.8 Hz), 2.66 (2 H, m), 3.03 (2 H, m), 3.57 (3 H, s), 3.60 (3 H, s), 7.16 (5 H, m). Compound 3c: ¹H NMR (300 MHz, CDCl₃): δ = 2.39 (1 H, dd, J = 5.7, 17.1 Hz), 2.65 (1 H, dd, J = 8.7, 17.1 Hz), 2.88 (1 H, dd, J = 10.5, 16.8 Hz), 3.09 (2 H, m), 3.57 (3 H, s), 3.60 (3 H, s), 7.42 (2 H, m), 8.01 (2 H, m). Compound 3d: ¹H NMR (300 MHz, CDCl₃): δ = 2.33 (1 H, dd, J = 5.1, 16.8 Hz), 2.61 (2 H, m), 2.98 (2 H, m), 3.57 (3 H, s), 3.60 (3 H, s), 3.72 (3 H, s), 6.76 (2 H, d, J = 8.7 Hz), 7.00 (1 H, d, J = 8.7 Hz). Compound 3e: ¹H NMR (300 MHz, CDCl₃): δ = 2.34 (1 H, dd, J = 4.5, 16.5 Hz), 2.62 (2 H, m), 3.02 (2 H, m), 3.57 (3 H, s), 3.62 (3 H, s), 3.72 (3 H, s), 6.67 (3 H, m), 7.15 (1 H, dd, J = 9.6, 17.4 Hz). Compound 3f: ¹H NMR (300 MHz, CDCl₃): δ = 2.33 (1 H, dd, J = 4.8, 17.1 Hz), 2.66 (2 H, m), 2.97 (1 H, dd, J = 6.3, 13.2 Hz), 3.14 (1 H, m), 3.55 (3 H, s), 3.59 (3 H, s), 3.75 (3 H, s), 6.79 (2 H, m), 7.00 (1 H, d, J = 9.0 Hz), 7.15 (2 H, m). Compound 3g: ¹H NMR (300 MHz, CDCl₃): δ = 2.35 (1 H, dd, J = 5.1, 16.8 Hz), 2.63 (2 H, dd, J = 8.4, 16.8 Hz), 2.78 (2 H, dd, J = 7.5, 12.9 Hz), 3.07 (2 H, m), 3.58 (3 H, s), 3.59 (3 H, s), 7.19 (2 H, d, J = 8.4 Hz), 7.83 (2 H, d, J = 8.1 Hz). Compound 3h: ¹H NMR (300 MHz, CDCl₃): δ = 2.33 (1 H, dd, J = 4.8, 16.8 Hz), 2.58 (2 H, m), 2.85 (6 H, s), 2.99 (2 H, m), 3.56 (3 H, s), 3.61 (3 H, s), 6.60 (2 H, d, J = 8.7 Hz), 6.95 (2 H, d, J = 8.7 Hz). Compound 3i: ¹H NMR (300 MHz, CDCl₃): δ = 2.32 (3 H, m), 2.64 (1 H, dd, J = 8.7, 16.5 Hz), 2.91 (1 H, m), 3.58 (3 H, s), 3.63 (3 H, s), 6.00 (1 H, m), 6.30 (1 H, d, J = 15.6 Hz), 7.19 (4 H, s).

9

All compounds have been satisfactorily characterised by ¹H NMR and ¹³C NMR. ¹H NMR data (300 MHz, CDCl₃) for 5a: δ = 2.85 (1 H, dd, J = 6.6, 14.1 Hz), 3.10 (1 H, dd, J = 8.7, 14.1 Hz), 3.35 (1 H, m), 3.85 (1 H, dd, J = 6.0, 13.8 Hz), 4.05 (1 H, dd, J = 8.4, 13.8 Hz), 5.00 (2 H, s), 7.10-7.25 (10 H, m), 7.67 (2 H, m), 7.78 (2 H, m). Compound 5b: ¹H NMR (300 MHz, CDCl₃): δ = 3.36 (1 H, m), 3.50 (2 H, m), 3.95 (1 H, dd, J = 4.8, 13.8 Hz), 4.15 (1 H, dd, J = 7.8, 13.8 Hz), 4.95 (2 H, s), 7.05 (2 H, dd, J = 1.7, 7.7 Hz), 7.15 (2 H, m,), 7.30 (3 H, m), 7.45 (2 H, m), 7.60-7.88 (6 H, m), 8.00 (1 H, d, J = 8.4 Hz). Compound 5c: ¹H NMR (300 MHz, CDCl₃): δ = 3.00 (1 H, dd, J = 5.9, 14.0 Hz), 3.15 (1 H, dd, J = 9.2, 14.0 Hz), 3.35 (1 H, m), 3.90 (1 H, dd, J = 6.0, 13.8 Hz), 4.08 (1 H, dd, J = 7.8, 13.8 Hz), 5.00 (2 H, s), 7.15 (2 H, m), 7.25 (3 H, m), 7.35 (1 H, m), 7.50 (1 H, d, J = 7.8 Hz), 7.70 (2 H, m), 7.85 (2 H, m), 8.00 (1 H, d, J = 8.1 Hz), 8.05 (1 H, s). Compound 5d: ¹H NMR (300 MHz, CDCl₃): δ 2.80 (1 H, dd, J = 6.6, 13.8 Hz), 3.00 (1 H, dd, J = 8.6, 14.0 Hz), 3.30 (1 H, m), 3.75 (3 H, s), 3.85 (1 H, dd, J = 6.0, 13.8 Hz), 4.05 (1 H, dd, J = 8.3, 13.7 Hz), 5.00 (2 H, s), 6.75 (2 H, d, J = 8.7 Hz), 7.05 (2 H, d, J = 8.7 Hz), 7.15 (2 H, m), 7.23 (3 H, m), 7.68 (2 H, m), 7.78 (2 H, m). Compound 5g: ¹H NMR (300 MHz, CDCl₃): δ = 2.55 (3 H, s), 2.95 (1 H, dd, J = 6.3, 14.1 Hz), 3.15 (1 H, dd, J = 8.7, 14.1 Hz), 3.35 (1 H, m), 3.90 (1 H, dd, J = 6.2, 14.0 Hz), 4.05 (1 H, dd, J = 8.1, 13.8 Hz), 5.00 (2 H, s), 7.15 (2 H, m), 7.18-7.28 (5 H, m), 7.70 (2 H, m), 7.78 (4 H, m). Compound 5j: ¹H NMR (300 MHz, CDCl₃): δ = 2.80 (1 H, dd, J = 6.5, 14.0 Hz), 3.00 (1 H, dd, J = 9.0, 14.1 Hz), 3.30 (1 H, m), 3.90 (1 H, dd, J = 6.3, 13.8 Hz), 4.05 (1 H, dd, J = 8.1, 13.8 Hz), 5.00 (2 H, s), 7.05 (2 H, d, J = 8.4 Hz), 7.15 (2 H, m), 7.23 (3 H, m), 7.29 (2 H, d, J = 8.4 Hz), 7.70 (2 H, m), 7.80 (2 H, m).