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General Procedure
for the Synthesis of 3: Heterocyclic ketene aminals 1 (1 mmol) and 2-[3-oxoisobenzofuran-1 (3H)-ylidene]malononitrile (2; 1 mmol) were stirred in DMF (5
mL) at 120 ˚C until the reaction was complete as monitored
by TLC (ca. 2-12 h). After the reaction mixture was cooled
to r.t., the solvents were removed in vacuo and the
resulting solids were subjected to recrystallization (MeOH-Et2O
or MeCN) to provide the desired fused heterospiro compounds 3.
Compound 3f:
yellow solid; mp 306-307 ˚C. IR (KBr): 3363 (m),
3331 (m), 2211 (m), 1633 (s), 1603 (s), 1582 (s), 1558 (s), 1508
(m), 1370 (s), 1311 (s), 931 (m), 849 (w), 763 (m), 732 (m), 678
(m), 652 (m) cm-¹. ¹H
NMR (300 MHz, DMSO-d
6): δ = 7.73
(d, J = 7.5 Hz, 1 H), 7.53-7.63
(m, 4 H), 7.44-7.47 (m, 4 H), 7.30-7.40 (m, 2
H), 7.20-7.25 (m, 1 H), 7.04 (d, J = 7.2
Hz, 1 H), 4.03-4.22 (m, 2 H), 3.79-3.94 (m, 2
H). ¹³C NMR (75 MHz, DMSO-d
6): δ = 192.0,
166.8, 154.4, 152.7, 142.9, 139.2, 137.7, 132.5, 137.0, 130.6, 130.2,
129.5, 129.1, 128.9, 128.3, 128.0, 126.7, 125.8, 117.1, 105.1, 77.9,
48.6, 45.4. HRMS (ESI): m/z [M + H]+ calcd
for C28H21N4O3
+:
461.1608; found: 461.1609. Compound 3o:
yellow solid; mp 205-207 ˚C. IR (KBr): 3282 (m),
3061 (m), 2212 (m), 1631 (s), 1604 (s), 1560 (s), 1528 (s), 1480
(m), 1376 (s), 1337 (s), 1280 (m), 1068 (m), 927 (m), 850 (m), 776
(m), 676 (m) cm-¹. ¹H
NMR (300 MHz, DMSO-d
6): δ = 7.63
(d, J = 6.9 Hz, 1 H), 7.17-7.31 (m,
6 H), 7.00 (d, J = 6.6 Hz, 1
H), 4.01-4.02 (m, 2 H), 3.40-3.42 (m, 2 H), 2.00-2.03
(m, 2 H). ¹³C NMR (75 MHz, DMSO-d
6): δ = 192.7,
166.8, 156.1, 154.5, 152.1, 139.7, 137.2, 132.4, 130.6, 130.2, 130.1,
129.9, 128.5, 124.2, 117.2, 103.2, 83.5, 48.6, 42.8, 18.6. HRMS
(ESI): m/z [M + H]+ calcd
for C23H18N4O3Br+:
477.0571; found: 477.0562.
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