## 3 Experimental Section
### Synthesis of Products **5** and **6** from 1-Alkenes  
_2-Butyl-2H,3H-[1,4]thiazin[2,3,4-ij]quinolin-4-ium bromide_ (**5**). A solution of bromine (0.072 g, 0.45 mmol) in methylene chloride (10 mL) was added dropwise to a solution of di(8-quinolinyl) disulfide (0.144 g, 0.45 mmol) in methylene chloride (10 mL), and the mixture was stirred for 10 min at room temperature. A solution of hexene-1 (0.076 g, 0.9 mmol) in methylene chloride (10 mL) was added dropwise. The reaction mixture was stirred for 48 h at room temperature and left overnight. The mixture was filtered, and the solvent was removed by rotary evaporator. The residue was washed with cold hexane and dried in vacuum, giving the product (0.248 g, 85% yield) in the form of a yellow powder, mp 220-221 \({}^{\circ}\)C._  
\({}^{1}\)H-NMR (400 MHz, DMSO-\(d_{6}\)): \(\delta\) 0.90 (t, \(J\) = 7.3 Hz, 3H, CH\({}_{3}\)), 1.31-1.39 (m, 2H, CH\({}_{2}\)), 1.47-1.54 (m, 2H, CH\({}_{2}\)), 1.61-1.68 (m, 1H, CH\({}_{2}\)), 1.80-1.89 (m, 1H, CH\({}_{2}\)), 3.94 (m, 1H, SCH), 5.01 (dd, \(J\) = 13.9, 8.5 Hz, 1H, NCH\({}_{2}\)), 5.36 (d, \(J\) = 13.9 Hz, 1H, NCH\({}_{2}\)), 7.88-7.92 (m, 1H, Hquino), 8.12-8.14 (m, 1H, Hquino), 8.18-8.22 (m, 2H, Hquino), 9.28-9.30 (m, 1H, Hquino), 9.39-9.41 (m, 1H, Hquino).  
\({}^{13}\)C-NMR (101 MHz, DMSO-\(d_{6}\)): \(\delta\) 13.75 (CH\({}_{3}\)), 21.65 (CH\({}_{2}\)), 28.03 (CH\({}_{2}\)), 30.81 (CH\({}_{2}\)), 36.21 (SCH), 62.05 (NCH\({}_{2}\)), 122.25 (Cquino), 126.40 (Cquino), 126.87 (Cquino), 129.39 (Cquino), 130.59 (Cquino), 133.14 (Cquino), 133.61 (Cquino), 148.65 (Cquino), 150.23 (Cquino).  
Anal. Calcd for C\({}_{15}\)H\({}_{13}\)BrNS: C 55.56, H 5.59, N 4.32, Br 24.64, S 9.89. Found: C 55.69, H 5.96, N 4.44, Br 24.86, S 10.10.  
_2-Pentyl-2H,3H-[1,4]thiazin[2,3,4-ij]quinolin-4-ium bromide_ (**6**). A solution of bromine (0.130 g, 0.80 mmol) in methylene chloride (10 mL) was added dropwise to a solution of di(8-quinolinyl) disulfide (0.261 g, 0.80 mmol) in methylene chloride (10 mL), and the mixture was stirred for 10 min at room temperature. A solution of heptene-1 (0.157 g, 1.6 mmol) in methylene chloride (10 mL) was added dropwise. The reaction mixture was stirred for 48 h at room temperature and left overnight. The mixture was filtered, and the solvent was removed by rotary evaporator. The residue was washed with cold hexane and dried in vacuum, giving the product (0.438 g, 81% yield) in the form of a yellow powder, mp 219-220 \({}^{\circ}\)C.  
\({}^{1}\)H-NMR (400 MHz, DMSO-\(d_{6}\)): 8 0.88 (s, 3H, CH\({}_{3}\)), 1.30-1.32 (m, 4H, CH\({}_{2}\)), 1.49-1.56 (m, 2H, CH\({}_{2}\)), 1.58-1.65 (m, 1H, CH\({}_{2}\)), 1.81-1.84 (m, 1H, CH\({}_{2}\)), 3.94 (m, 1H, SCH), 5.01 (dd, \(J\) = 13.7, 8.3 Hz, 1H, NCH\({}_{2}\)), 5.35 (d, \(J\) = 13.7 Hz, 1H, NCH\({}_{2}\)), 7.88-7.92 (m, 1H, Hquino), 8.12-8.13 (m, 1H, Hquino), 8.18-8.22 (m, 2H, Hquino), 9.27-9.30 (m, 1H, Hquino), 9.39-9.41 (m, 1H, Hquino).  
\({}^{13}\)C-NMR (101 MHz, DMSO-\(d_{6}\)): 8 13.78 (CH\({}_{3}\)), 21.82 (CH\({}_{2}\)), 25.48 (CH\({}_{2}\)), 30.60 (CH\({}_{2}\)), 36.18 (SCH), 61.97 (NCH\({}_{2}\)), 122.21 (Cquino), 126.36 (Cquino), 126.81 (Cquino), 129.33 (Cquino), 130.54 (Cquino), 132.54 (Cquino), 133.10 (Cquino), 148.60 (Cquino), 150.19 (Cquino).  
Anal. Calcd for C\({}_{16}\)H\({}_{20}\)BrNS: C 56.80, H 5.96, N 4.14, Br 23.62, S 9.48. Found: C 57.02, H 6.11, N 4.24, Br 23.97, S 9.72.