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DOI: 10.1055/s-0028-1087533
The Baylis-Hillman Bromides as Versatile Synthons: A Facile One-Pot Synthesis of Indolizine and Benzofused Indolizine Frameworks
Publication History
Publication Date:
21 January 2009 (online)
Abstract
A facile one-pot synthesis of indolizine, benzofused indolizines {pyrrolo[1,2-a]quinoline and pyrrolo[1,2-a]isoquinoline} derivatives from the Baylis-Hillman (B-H) bromides, via an interesting strategy involving 1,5-cyclization of nitrogen ylides has been described.
Key words
Baylis-Hillman bromides - 1,5-cyclization strategy - indolizines - benzofused indolizines - quinoline - isoquinoline
- Supporting Information for this article is available online:
- Supporting Information
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References and Notes
1-Aza-8-cyano-7-phenylbicyclo[4.3.0]nona-2,4,6,8-tetraene (2a) - Representative Procedure
To
2-(bromomethyl)-3-phenylprop-2-enenitrile
[¹0]
(1
mmol, 0.222 g) pyridine (3 mL) was added and stirred for 15 min (formation
of pyridinium salt was observed as shown by TLC) at r.t. The reaction
mixture was diluted with DMF (3 mL) and K2CO3 (5
mmol, 0.690 g) was added. The reaction mixture was then heated at
80 ˚C for 3 h and was allowed to cool to r.t.
Saturated aq NaCl soln (5 mL) was added and extracted with CH2Cl2 (5 × 10
mL). The combined organic layer was dried over anhyd Na2SO4.
Solvent was evaporated, and the residue, thus obtained, was purified
by column chromatography (SiO2, 5% EtOAc in
hexanes) to furnish the pure compound 2a as
a colorless solid. Yield 52% (0.114 g); mp 128-130 ˚C. ¹H
NMR (400 MHz, CDCl3): δ = 6.60-6.70 (m,
1 H), 6.77-6.86 (m, 1 H), 7.32-7.40 (m, 1 H),
7.46-7.53 (m, 2 H), 7.56-7.68 (m, 3 H), 7.74 (s,
1 H), 7.88 (d, 1 H, J = 7.2
Hz). ¹³C NMR (100 MHz, CDCl3): δ = 96.94,
113.60, 116.22, 117.46, 118.16, 118.92, 120.05, 125.31, 127.15, 128.67,
129.00, 129.68, 132.56. IR (KBr): ν = 2222 cm-¹. LC-MS: m/z = 219 [M + H]+.
Anal. Calcd for C15H10N2: C, 82.55;
H, 4.62; N, 12.84. Found: C, 82.51; H, 4.65; N, 12.70.
Detailed X-ray crystallographic data are available from the CCDC, 12 Union road, Cambridge CB2 1EZ, UK; for compounds 2a (CCDC # 693505), 3a (CCDC # 693506), 4a (CCDC # 693507).
13
1-Aza-12-cyano-11-phenyltricyclo[8.3.0.0
²,7
]trideca-2,4,-6,8,10,12-hexaene (3a) - Representative Procedure
To
a stirred solution of 2-(bromomethyl)-3-phenylprop-2-enenitrile
(1 mmol, 0.222 g) in DMF (3 mL) was added quinoline (2 mmol, 0.258
g) at r.t. After stirring for 1 h (salt formation was observed as
evidenced by TLC), K2CO3 (5 mmol, 0.690 g)
was added and heated for 5 h at 80 ˚C. The reaction
mixture was allowed to cool to r.t. and diluted with sat. aq NaCl
soln (5 mL) and extracted with CH2Cl2 (5 × 10 mL).
The combined organic layers were dried over anhyd Na2SO4.
Solvent was evaporated, and the residue, thus obtained, was purified
by column chromatography (SiO2, 8% EtOAc in
hexanes) to furnish the pure compound 3a as
a colorless solid. Yield 45% (0.120 g); mp 160-162 ˚C.
¹H
NMR (400 MHz, CDCl3): δ = 7.11 (d,
1 H, J = 9.6
Hz), 7.34-7.68 (m, 9 H), 7.85 (d, 1 H, J = 8.4
Hz), 8.26 (s, 1 H). ¹³C NMR (100 MHz,
CDCl3): δ = 96.68, 114.43, 116.19, 117.35,
118.04, 120.39, 122.03, 124.52, 125.64, 127.50, 128.10, 128.84,
128.92, 129.00, 129.05, 132.28, 132.38.
IR (KBr): ν = 2226
cm-¹. LC-MS: m/z = 269 [M + H]+.
Anal. Calcd for C19H12N2: C, 85.05;
H, 4.51; N, 10.44. Found: C, 85.11; H, 4.54; N, 10.57.
The single crystal X-ray structure revealed the presence of two molecules in the asymmetric unit. For clarity we have shown one molecule in the ORTEP diagram.