References
1 C.D.R.I. Communication No. 6290.
2a
Torssell KGB. In
Natural Product Chemistry
Wiley;
Chichester:
1983.
2b
Thomson RH.
The Chemistry of Natural
Products
Blackie and Son;
Glasgow:
1985.
3a
Noyori R.
Chem. Soc. Rev.
1989,
18:
187
3b
Andersen NG.
Maddaford SP.
Keay BA.
J. Org. Chem.
1996,
61:
9556
4
Ullmann F.
Bielecki J.
Chem. Ber.
1901,
34:
2174
5
Fanta PE.
Synthesis
1974,
9
6
Semmelhack MF.
Helquist P.
Lones LD.
Keller L.
Mendelson L.
Ryono LS.
Smith JG.
Stanffer RD.
J. Am. Chem. Soc.
1981,
103:
6460
7
Lam H.
Marcuccio SM.
Svirskaya PI.
Greeberg S.
Lever ABP.
Leznoff CC.
Cerny RL.
Can. J. Chem.
1989,
67:
1087
8
Negishi E.
Acc.
Chem. Res.
1982,
15:
340
9a
Kumada M.
Pure Appl. Chem.
1980,
52:
669
9b
Bailey TR.
Tetrahedron Lett.
1986,
27:
4407
9c
Echavarren AM.
Stille JK.
J.
Am. Chem. Soc.
1987,
109:
5478
10
Suzuki A.
Miyaura N.
Chem. Rev.
1995,
95:
2457
11
Waldvogel SR.
Synlett
2002,
622
12a
Meyers AI.
Lutomski KA.
J. Am. Chem. Soc.
1982,
104:
789
12b
Meyers AI.
Himmelsbach RJ.
J.
Am. Chem. Soc.
1985,
107:
682
12c
Bringmann G.
Walter R.
Weirich R.
Angew.
Chem., Int. Ed. Engl.
1990,
29:
977
13a
Victory P.
Borrell JI.
Vidal-Ferran A.
Montenegro E.
Jimeno ML.
Heterocycles
1993,
36:
2273
13b
Victory P.
Alvarez-Larena A.
Germain G.
Kessels R.
Piniella JF.
Vidal-Ferran A.
Tetrahedron
1995,
51:
235
13c
Murugan P.
Shanmugasundaram P.
Ramakrishnan VT.
Srividya N.
Ramamurthy P.
Indian J. Chem., Sect. B
1998,
37:
737
14
Khaidem IB.
Singh SL.
Singh LR.
Khan MZR.
Indian. J.
Chem., Sect. B
1996,
35:
911
15
Sepiol J.
Milart P.
Tetrahedron
1985,
41:
5261
16
Yu Z.
Velasco D.
Tetrahedron Lett.
1999,
40:
3229
17a
Ram VJ.
Verma M.
Hussaini FA.
Shoeb A.
J. Chem.
Res., Synop.
1991,
98
17b
Ram VJ.
Verma M.
Hussaini FA.
Shoeb A.
Liebigs.
Ann. Chem.
1991,
1229
18
General Procedure
for the Synthesis of 3a:
A mixture of 6-aryl-3-carbomethoxy-4-methylsulfanyl-2H-pyran -2-one 1(0.28
g, 1 mmol), malononitrile (0.07 g, 1 mmol) and powdered KOH (0.06
g, 1 mmol) in dry DMF (12 mL) was stirred at r.t. for 30 h. At the
end reaction mixture was poured into ice water with vigorous stirring
and finally neutralized with 10% HCl. The solid thus obtained
was filtered and purified on a silica gel column using chloroform as
eluent; white solid, yield 0.12 g (40.26%), mp 170 °C.
IR (KBr): νmax = 3444, 2209 (medium
and sharp), 1672 cm-1. 1H NMR
(200 MHz, CDCl3): δ = 2.45 (s, 3 H,
SCH3), 3.98 (s, 3 H, OCH3), 6.41 (brs, 2 H,
NH2), 6.55 (s, 1 H, ArH), 7.47-7.54 (m, 5 H,
ArH). MS (EI): m/z = 298
(M+), 266. Anal. Calcd for C16H14N2O2S:
C, 64.41; H, 4.73; N, 9.39. Found: C, 64.54; H, 4.77; N, 9.44. 3d: White solid; mp 185 °C.
IR (KBr): νmax = 3422, 2208 (medium
and sharp), 1680 cm-1. 1H NMR
(200 MHz, CDCl3): δ = 2.44 (s, 3 H,
SCH3), 3.98 (s, 3 H, OCH3), 6.42 (brs, 2 H,
NH2) 6.50 (s, 1 H, ArH), 7.47 (s, 4 H, ArH). 13C
NMR (200 MHz, CDCl3): δ = 17.06, 52.26, 93.23,
109.76, 114.31, 117.31, 129.43, 130.12, 135.99, 136.9, 147.54, 151.88,
153.07, 164.49. MS (EI): m/z = 332, 300,
176. Anal. Calcd for C16H13ClN2O2S:
C, 57.74; H, 3.94; N, 8.41. Found: C, 57.83; H, 3.98; N, 8.52.