1.2.1. (s, 1H), 3.81 (s, 3H). 13C NMR

1.2.1.     
7-(2-methoxyphenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione
(2C):

1H NMR ?:
8.15 (d, J = 7.3 Hz, 1H), 7.99 (dd, J = 7.6, 1.1 Hz, 1H), 7.90
(td, J = 7.7, 1.3 Hz, 1H), 7.70 (td, J = 7.6, 1.0 Hz, 1H), 7.19 –
7.12 (m, 2H), 7.08 (s, 1H), 6.96 (d, J = 7.8 Hz, 1H), 6.80 (td, J
= 7.5, 0.8 Hz, 1H), 6.72 (s, 1H), 6.03 (d, J = 0.8 Hz, 1H), 5.96 (d, J
= 0.8 Hz, 1H), 5.37 (s, 1H), 3.81 (s, 3H). 13C NMR ?: 177.73,
177.68, 157.88, 156.19, 146.69, 144.79, 142.83, 135.12, 133.03, 131.36, 130.39,
130.21, 128.74, 128.43, 128.01, 124.28, 120.69, 116.60, 113.43, 111.73, 107.06,
101.75, 98.47, 55.75, 32.08. HRMS (ESI) Calcd. for C25H17O6
(M+H+): 413.1020. Found: 413.1001.

1.2.2.      7-(3-methoxyphenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione (2D):

1H NMR ?: 8.15 (d, J =
7.3 Hz, 1H), 8.00 (dd, J = 7.5, 1.0 Hz, 1H), 7.90 (td, J = 7.6,
1.3 Hz, 1H), 7.70 (td, J = 7.5, 1.1 Hz, 1H), 7.17 (dd, J = 13.0,
4.9 Hz, 2H), 6.90 – 6.88 (m, 1H), 6.86 (s, 1H), 6.82 (d, J = 7.7 Hz,
1H), 6.73 (dd, J = 8.1, 2.0 Hz, 1H), 6.07 (d, J = 0.8 Hz, 1H), 6.00
(d, J = 0.9 Hz, 1H), 5.04 (s, 1H), 3.70 (s, 3H); 13C NMR ?:
176.80, 176.56, 158.27, 156.20, 145.88, 145.59, 143.97, 141.71, 133.99, 130.37,
129.29, 129.20, 128.57, 178.39, 123.34, 118.69, 115.59, 113.03, 112.88, 110.48,
106.78, 100.82, 97.58, 53.95, 36.55; HRMS (ESI) Calcd. for C25H17O6
(M+H+): 413.100. Found: 413.107.

1.2.3.     
7-(3,4-dimethylphenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione
(2E):

1H NMR ?:
8.14 (d, J = 7.8 Hz, 1H), 7.98 (dd, J = 7.6, 0.9 Hz, 1H), 7.88
(td, J = 7.7, 1.2 Hz, 1H), 7.69 (td, J = 7.6, 1.0 Hz, 1H), 7.11
(s, 1H), 7.06 (s, 1H), 7.02 – 6.97 (m, 2H), 6.79 (s, 1H), 6.04 (d, J =
0.8 Hz, 1H), 5.98 (d, J = 0.8 Hz, 1H), 4.99 (s, 1H), 2.13 (s, 3H), 2.11
(s, 3H). 13C NMR ?: 177.82, 177.62, 157.03, 146.74, 144.93, 142.64,
142.59, 136.13, 135.04, 134.42, 131.33, 130.30, 130.22, 129.50, 128.57, 128.37,
124.93, 124.35, 116.95, 114.31, 107.81, 101.77, 98.57, 37.25, 19.43, 18.86.
HRMS (ESI) Calcd. for C26H19O5 (M+H+):
411.1227. Found: 411.1239.

1.2.4.     
7-(p-tolyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione (2F):

1H NMR ?: 8.13 (d, J
= 7.8 Hz, 1H), 7.98 (dd, J = 7.6, 1.0 Hz, 1H), 7.88 (td, J = 7.7,
1.3 Hz, 1H), 7.69 (td, J = 7.6, 1.1 Hz, 1H), 7.18 (d, J = 8.1 Hz,
2H), 7.11 (s, 1H), 7.04 (d, J = 8.0 Hz, 2H), 6.79 (s, 1H), 6.04 (d, J
= 0.9 Hz, 1H), 5.98 (d, J = 0.9 Hz, 1H), 5.03 (s, 1H), 2.20 (s, 3H). 13C
NMR ?: 177.76, 177.56, 157.03, 146.77, 144.95, 142.67, 142.20, 135.64, 135.00,
131.32, 130.23, 130.17, 128.98, 128.37, 127.45, 124.31, 116.83, 114.29, 107.75,
101.77, 98.53, 37.20, 20.48. HRMS (ESI) Calcd. for C25H17O5
(M+H+): 397.1071. Found: 397.1089.

1.2.5.      7-(4-chlorophenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione (2G):

1H NMR ?: 8.17 (d, J =
7.5 Hz, 1H), 8.03 (dd, J = 7.5, 1.0 Hz, 1H), 7.90 (td, J = 7.6,
1.2 Hz, 1H), 7.74 (td, J = 7.7, 1.0 Hz, 1H), 7.35 – 7.27 (m, 4H), 7.15
(s, 1H), 6.86 (s, 1H), 6.09 (d, J = 0.7 Hz, 1H), 6.10 (d, J = 0.7
Hz, 1H), 5.15 (s, 1H); 13C NMR ?: 176.74, 176.46, 156.21, 146.00, 144.07,
142.99, 141.73, 133.93, 130.42, 130.18, 129.37, 129.15, 128.58, 127.35, 123.36,
115.12, 112.70, 106.75, 100.87, 97.66, 35.98; HRMS (ESI) Calcd. for C24H14ClO5
(M+H+): 417.054. Found: 417.056.

1.2.6.     
7-(4-bromophenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione
(2H):

1H NMR ?: 8.14 (d, J
= 7.8 Hz, 1H), 7.99 (dd, J = 7.6, 1.0 Hz, 1H), 7.88 (td, J = 7.7,
1.3 Hz, 1H), 7.70 (td, J = 7.6, 1.1 Hz, 1H), 7.46 – 7.42 (m, 2H), 7.31 –
7.26 (m, 2H), 7.14 (s, 1H), 6.83 (s, 1H), 6.06 (d, J = 0.9 Hz, 1H), 6.00
(d, J = 0.9 Hz, 1H), 5.10 (s, 1H). 13C NMR ?: 177.71, 177.44,
157.18, 147.00, 145.07, 144.39, 142.69, 134.92, 131.40, 131.26, 130.33, 130.11,
129.96, 128.34, 124.35, 119.68, 116.00, 113.62, 107.72, 101.86, 98.63, 37.06.
HRMS (ESI) Calcd. for C24H14BrO5 (M+H+):
461.0019. Found: 461.0034.

1.2.7.     
7-(4-nitrophenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione
(2I):

1H NMR ?: 8.16 (d, J
= 7.8 Hz, 1H), 8.13 – 8.10 (m, 2H), 8.00 (dd, J = 7.6, 1.0 Hz, 1H),  7.89 (td, J = 7.7, 1.3 Hz, 1H), 7.71
(td, J = 7.6, 1.1 Hz, 1H), 7.65 – 7.61 (m, 2H), 7.16 (s, 1H), 6.84 (s,
1H), 6.06 (d, J = 0.8 Hz, 1H), 6.00 (d, J = 0.8 Hz, 1H), 5.28 (s,
1H). 13C NMR ?: 177.65, 177.34, 157.39, 152.23, 147.26, 146.19,
145.17, 142.70, 134.90, 131.52, 130.45, 130.01, 129.13, 128.34, 124.43, 123.64,
115.09, 112.98, 107.74, 101.97, 98.78, 37.49. HRMS (ESI) Calcd. for C24H14NO7
(M+H+): 428.0765. Found: 428.0777.

1.2.8.     
7-(3-nitrophenyl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione
(2J):

1H NMR ?: 8.20 (t, J
= 1.9 Hz, 1H), 8.16 (d, J = 7.7 Hz, 1H), 8.05 – 7.98 (m, 2H), 7.89 (td, J
= 7.7, 1.3 Hz, 1H), 7.79 (d, J = 7.9 Hz, 1H), 7.71 (td, J = 7.6,
1.0 Hz, 1H), 7.56 (t, J = 8.0 Hz, 1H), 7.18 (s, 1H), 6.88 (s, 1H), 6.06
(d, J = 0.8 Hz, 1H), 6.00 (d, J = 0.8 Hz, 1H), 5.32 (s, 1H). 13C
NMR ?: 177.77, 177.39, 157.37, 147.89, 147.30, 147.03, 145.24, 142.86, 134.91,
134.71, 131.54, 130.63, 130.11, 129.99, 128.36, 124.49, 122.66, 121.72, 115.46,
113.18, 107.89, 102.01, 98.82, 37.31. HRMS (ESI) Calcd. for C24H14NO7
(M+H+): 428.0765. Found: 428.0763.

1.2.9.      7-(thiophen-2-yl)-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione
(2K):

1H
NMR ?: 8.17 (d, J = 7.6 Hz, 1H), 8.03 (dd, J = 7.7, 1.0 Hz, 1H),
7.90 (td, J = 7.8, 1.3 Hz, 1H), 7.70 (td, J = 7.7, 1.0 Hz, 1H),
7.26 (dd, J = 5.1, 1.2 Hz, 1H), 7.18 (s, 1H), 7.03 (s, 1H), 6.99 (d, J
= 3.2 Hz, 1H), 6.89 (dd, J = 5.1, 3.5 Hz, 1H), 6.10 (d, J =
0.9 Hz, 1H), 6.05 (d, J = 0.9 Hz, 1H), 5.45 (s, 1H); 13C NMR
?: 176.72, 176.49, 156.26, 147.80, 146.26, 144.11, 142.04, 134.13, 130.61, 129.22,
129.07, 127.56, 125.93, 123.80, 123.76, 123.44, 115.24, 113.11, 106.93, 100.99,
97.67, 31.43; HRMS (ESI) Calcd. for C22H13O5S
(M+H+): 389.048. Found: 389.041.

1.2.10. 
7-phenyl-6H-benzoh1,3dioxolo4,5-bxanthene-5,6(7H)-dione (2L):

1H NMR ?: 8.16 (d, J
= 7.3 Hz, 1H), 8.00 (dd, J = 7.6, 1.0 Hz, 1H), 7.90 (td, J = 7.7,
1.2 Hz, 1H), 7.71 (td, J = 7.6, 1.0 Hz, 1H), 7.34 – 7.30 (m, 2H), 7.25
(t, J = 7.7 Hz, 2H), 7.17 – 7.13 (m, 2H), 6.85 (s, 1H), 6.06 (d, J
= 0.8 Hz, 1H), 5.99 (d, J = 0.7 Hz, 1H), 5.10 (s, 1H). 13C
NMR ?: 178.28, 178.05, 157.69, 147.36, 145.58, 145.49, 143.24, 135.49, 131.87,
130.77, 130.71, 128.96, 128.88, 128.09, 127.04, 124.84, 117.20, 114.66, 108.28,
102.31, 99.09, 38.09. HRMS (ESI) Calcd. for C24H15O5
(M+H+): 383.0914. Found: 383.0928.