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General Procedure
for the Silver Acetate Catalyzed Mannich Reactions (Table 4, entry
1): Ligand (0.0075 mmol) and AgOAc (1.2 mg, 0.007 mmol) were
placed in a dried Schlenk tube under a nitrogen atmosphere and Et2O (1.0
mL) was added. The mixture was stirred at room temperature for about
0.5 h. After cooling to the indicated temperature, α,α-dicyanoolefin
(0.23 mmol) was added as a solution in Et2O (1.0 mL)
followed by addition of aldimine (0.276 mmol). Progress of the Ag-catalyzed
Mannich reaction was typically monitored by TLC analysis. Upon consumption
of the limiting reagent, the reaction was isolated by a short column
of silica gel chromatography directly. The ratio (syn/anti) was determined by NMR spectroscopic
analysis of the crude product. The crude adducts were purified by
column chromatography on silica gel.
<A NAME="RS05709ST-26">26</A>
Selected physical and spectral data
for 7a: white solid, 64% ee, [α]D
²³ -82.9
(c 1.03, CHCl3); R
f
0.55
(PE-EtOAc, 5:1); HPLC (Chiralpak AD-H column; i-PrOH-hexane, 95:5; 0.8 mL/min;
254 nm; 30 ˚C): t
R(minor) = 8.2
min, t
R(major) = 13.6
min; ¹H NMR (400 MHz, CDCl3): δ = 8.06
(d, J = 7.9 Hz,
1 H), 7.51 (t, J = 7.4
Hz, 1 H), 7.41-7.24 (m, 7 H), 4.94-4.92
(m, 1 H), 4.53 (t, J = 10.4
Hz, 1 H), 3.72-3.68 (m, 1 H), 2.89-2.85
(m, 1 H), 2.70-2.66 (m, 1 H), 1.93-1.89
(m, 1 H), 1.51-1.47 (m, 1 H), 1.42 (s,
9 H); ¹³C NMR (100 MHz, CDCl3): δ = 175.1,
154.7, 140.0, 138.9, 133.5, 129.8, 129.4, 128.7, 128.6, 127.0, 126.9,
114.2, 113.6, 82.1, 80.2, 57.5, 49.1, 28.3, 25.9, 25.2.