## Experimental
### General procedure for the preparation of the polymeric ammonium salts **2** and **9**-**13**. The corresponding halogenated polymer (1 meq) was added to a suspension of the alkaloid **6**, **7** or **8** (2 mmol) in toluene (10 mL) and the mixture was stirred under reflux for 24 h. The reaction mixture was cooled to r.t. and the solid was filtered, washed with AcOEt (3 x 15 mL) and dried in vacuo, affording the polymer-supported ammonium salts **2a**, **2c**, **9**, **10a**, **11**, **12** and **13a**. The _O_-allylatedpolymeric ammonium salts **2b**, **10b** and **13b** were obtained following the same procedure, but starting from \(O\)-allyl cinchonidine [5a]. _Polymeric ammonium salt_**2a**  
IR (KBr) cm-1: 3415 (broad), 3060, 2940, 1596, 1430, 1220, 1100, 750. Microanalysis: % N = 3.25; loading = 1.7 mmol g-1  
_Polymeric ammonium salt_**2b**  
IR (KBr) cm-1: 3080, 2939, 1590, 1440, 1231, 1103, 760. Microanalysis: % N = 2.03; loading = 1.2 mmol g-1  
_Polymeric ammonium salt_**2c**  
IR (KBr) cm-1: 3398 (broad), 3020, 2920, 615, 1497, 1455, 1241, 1012, 757. Microanalysis: % N = 3.06; loading = 1.6 mmol g-1  
_Polymeric ammonium salt_**9**  
IR (KBr) cm-1: 3382 (broad), 3033, 2925, 1596, 1499, 1441, 1011, 756. Microanalysis: % N = 1.72; loading = 1.6 mmol g-1  
_Polymeric ammonium salt_**10a**  
IR (KBr) cm-1: 3241 (broad), 3015, 2925, 1598, 1460, 1100, 763. Microanalysis: % N = 1.89; loading = 0.9 mmol g-1  
_Polymeric ammonium salt_**10b**  
IR (KBr) cm-1: 3054, 2929, 1645, 1448, 1148, 695. Microanalysis: % N = 0.39; loading = 0.2 mol g-1  
_Polymeric ammonium salt_**11**  
IR (KBr) cm-1: 3370 (broad), 3019, 2912, 1602, 1488, 1448, 1233, 1025, 751. Microanalysis: % N = 1.39; loading = 0.6 mmol g-1  
_Polymeric ammonium salt_**12**  
IR (KBr) cm-1: 3351 (broad), 3063, 2919, 1599, 1457, 1221, 1115, 754. Microanalysis: % N = 2.51%; loading = 1.2 mmol g-1  
_Polymeric ammonium salt_**13a**  
IR (KBr) cm-1: 3505 (broad), 3020, 2840, 1602, 1452, 1295, 1240, 1105, 699. Microanalysis: % N = 0.37; loading = 0.4 mmol g-1_Polymeric ammonium salt_**13b**  
IR (KBr) cm^-1: 2924, 1618, 1460, 1356, 1252, 1110, 695. Microanalysis: % N = 0.30; loading = 0.4 mmol g^-1  
_Preparation of polymeric ammonium salt_**16**  
A suspension of Merrifield resin (Fluka, 1% DVB, 1.7 meq. Cl/g resin) (3 meq, 1.76 g) and thiourea (12.78 mmol, 971 mg) in a mixture of THF (20 mL) and EtOH (6 mL) is refluxed for 2 days and the resin thus obtained is filtered and washed successively with water (3 x 20 mL), THF (3 x 20 mL) and benzene (3 x 20 mL). The solid was then suspended in benzene (27 mL) and a mixture of tetrabutylammonium iodide (0.08 mmol, 28 mg) and NaOH (25.95 mmol, 1.038 g) in water (1.4 mL) was added. The reaction mixture was stirred at 80 \({}^{\circ}\)C under nitrogen for 2 days and the resulting solid was filtered and washed successively with THF (3 x 20 mL), water (3 x 20 mL), THF/6M HCl (3:1 v/v, 3 x 20 mL), water (3 x 20 mL), THF, (3 x 20 mL), acetone (3 x 20 mL), CH\({}_{2}\)Cl\({}_{2}\) (3 x 20 mL) and MeOH (3 x 20 mL). After drying in vacuo (15 Torr), the resin **15**[25] (1.85 g) was obtained. A suspension of **15** (1 mmol, 654 mg) in toluene (12 mL) was treated with NaH (60% mineral oil, 1.2 mmol, 30 mg) and 9,10-dichloromethylanthracene [26] (2 mmol, 550 mg) was added. The mixture was refluxed 24 h and the resulting solid was filtered, washed with AcOEt (4 x 20 mL) and treated with cinchonidine (**6**) as in the preparation of the former ammonium salts (see above), to give polymeric ammonium salt **16**. IR (KBr) cm^-1: 3399 (broad), 3049, 3015, 2910, 1598, 1499, 1451, 755, 698.