Molecular and crystal structures of two Nα-protected α-aminoacyl fluorides and their free carboxylic acid synthetic precursors1
Abstract
The molecular and crystal structures of N-para-toluenesulphonyl-α-aminoisobutyric acid fluoride (1), N-para-toluenesulphonyl-N-methyl-α-aminoisobutyric acid fluoride (2), N-para-toluenesulphonyl-α-aminoisobutyric acid (3), and N-para-toluenesulphonyl-N-methyl-α-amino-isobutyric acid (4) have been determined by X-ray diffraction. Crystal parameters: (1) monoclinic, space group P21/a, a = 24.264(3) Å, b = 8.386(2) Å, c = 6.245(1) Å, β = 96.5(2)°, and Z = 4; (2) monoclinic, space group P21/n, a = 7.606(1) Å, b = 14.954(2) Å, c = 11.969(2) Å, β = 92.3(2)°, and Z = 4; (3) monoclinic, space group P21/n, a = 11.151(2) Å, b = 6.168(1) Å, c = 18.669(2) Å, β = 91.3(2)°, and Z = 4; (4) monoclinic, space group P21/c, a = 11.993(2) Å, b = 10.322(2) Å, c = 12.123(2) Å, β = 115.9(2)°, and Z = 4. The structures were solved by direct methods. The least-squares refinements led to conventional R factors of 0.044, 0.059, 0.045, and 0.056 for (1)–(4), respectively. This is the first geometrical and conformational characterization at atomic resolution of two Nα-protected α-aminoacids containing the elusive acyl fluoride C-activating group.[unk]
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