Tetrahedron letters

Synthesis of diazaquinomycin A and B: The first double Knorr cyclization

TR Kelly, JA Field, Q Li

Index: Kelly, T. Ross; Field, Jeffrey, A.; Li, Qun Tetrahedron Letters, 1988 ,  vol. 29,  # 29  p. 3545 - 3546

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Citation Number: 28

Abstract

... Tetrahedron Letters. ... Tetrahedron Lett., 24 (1983), p. 3643. ... 1655 cm -1 ; 1 H NMR (DMSO-d 6 ) δ 0.83 (6H, t, J = 7.3 Hz), 1.23 (6H, d, J = 7.0 Hz), 1.49 (4H, apparent sextet, J = 7.3 Hz), 2.53 (2H, t, J = 7.3 Hz), 2.54 (2H, t, J = 7.3 Hz), 3.88 (2H, q, J = 7.0 Hz), 6.96 (2H, s), 8.61 (1H, br s), 9.05 (1H, br s), 9.84 (2H, br s). 11: IR (KBr) υ 3300, 1615 cm -1 . 13 IR (neat) υ 1730 cm -1 ; 1 H NMR (CDCl 3 ) δ 0.91 (3H, t, J = 7.4 Hz), 1,21 (3H, d, J = 7.3 Hz), 1.27 (3H, t, J = 7.3 Hz ...