Structural study of aldose reductase inhibitors. Ten oxazolecarbamate derivatives

(1) Benzyl 4-isopropyl-5-phenyl-2-oxazolecarbamate, C20H20N2O3, Mr = 336.39, P1, a = 19.469 (7), b = 11.270 (3), c = 8.667 (3) A, alpha = 95.48 (3), beta = 99.61 (3), gamma = 104.96 (3) degrees, V = 1792 (1) A3, Z = 4, Dm = 1.266 (2), Dx = 1.247 g cm-3, lambda (Cu K alpha) = 1.5418 A, mu = 6.49 cm-1, F(000) = 712, T = 288 K, R = 0.048 for 5244 reflections. (2) Benzyl 4-ethyl-5-phenyl-2-oxazolecarbamate, C19H18N2O3, Mr = 322.37, P2(1)/n, a = 9.131 (7), b = 18.81 (1), c = 9.680 (8) A, beta = 101.07 (3) degrees, V = 1631 (2) A3, Z = 4, Dm = 1.310 (2), Dx = 1.313 g cm-3, lambda (Cu K alpha) = 1.5418 A, mu = 6.92 cm-1, F(000) = 680, T = 288 K, R = 0.063 for 2535 reflections. (3) Benzyl 4-methyl-5-phenyl-2-oxazolecarbamate, C18H16N2O3, Mr = 308.34, P2(1)/n, a = 9.210 (7), b = 8.785 (6), c = 19.800 (9) A, beta = 99.60 (3) degrees, V = 1580 (2) A3, Z = 4, Dm = 1.299 (3), Dx = 1.300 g cm-3, lambda (Cu K alpha) = 1.5418 A, mu = 6.93 cm-1, F(000) = 648, T = 288 K, R = 0.057 for 2190 reflections.(ABSTRACT TRUNCATED AT 250 WORDS)