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Volumn 2, Issue 3, 2005, Pages 231-234

Regioselective synthesis of 3-(aryloxyacetyl)-2,3-dihydrothieno[3,2-c] [1] benzothiopyran-4-ones: A tandem [2,3] and [3,3]sigmatropic rearrangement approach

(3) Majumdar, K C a Chattopadhyay, S K a Ghosh, M a

a UNIVERSITY OF KALYANI (India)

Author keywords

3 (aryloxyacetyl) 2; 3 dihydrothieno 3,2 c 1 benzothiopyran 4 ones; 4 mercaptothiopyran 2 ones; 2,3 and 3,3 sigmatropic rearrangement

Indexed keywords

EID: 33746139250 PISSN: 15701786 EISSN: None Source Type: Journal
DOI: 10.2174/1570178053765294 Document Type: Review

Times cited : (4)

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31
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- 2: C, 68.18; H, 4.54. Found, C, 68.38; H, 4.72.
- 2: C, 68.18; H, 4.54. Found, C, 68.38; H, 4.72.

32
- 46149090256
- Compound 4a: Yield: 91, white solid; mp, 125 °C. UV (EtOH, λmax, 343, 284, 274, 236 nm. IR (KBr, γmax, 2921, 1725, 1473, 1047, 816 cm-1. 1H NMR (CDCl3, 300 MHz, δH, 2.28 (s, 3H, CH3, 3.57 (dd, 1H, J, 9, 12 Hz, SCH2, 3.64 (dd, 1H, J, 6, 12 Hz, SCH2, 4.82 (d, 1H, J, 17 Hz, OCH2, 4.88 (d, 1H, J, 17 Hz, OCH2) 4.96 (dd, 1H, J, 6, 9 Hz, 6.81-7.68 (m, 8H, ArH, MS m/z: 367 M, Anal. Calcd. For C20H15 O3S2: C, 65.39; H, 4.08. Found, C, 65.64; H, 4.29
- 2: C, 65.39; H, 4.08. Found, C, 65.64; H, 4.29.

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34
- 46149123991
- 2: C,60.00; H, 3.07. Found, C, 60.21; H, 3.31.
- 2: C,60.00; H, 3.07. Found, C, 60.21; H, 3.31.

35
- 0033613674
- (a) Majumdar, K. C.; Biswas, P. Tetrahedron 1999, 55, 1449.
- (1999) Tetrahedron , vol.55 , pp. 1449
- Majumdar, K.C.¹ Biswas, P.²

36
- 0032541554
- (b) Majumdar, K. C.; Biswas, P. Tetrahedron 1998, 54, 11603.
- (1998) Tetrahedron , vol.54 , pp. 11603
- Majumdar, K.C.¹ Biswas, P.²

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