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The crystal structure of the title compound N-(1-ethoxycarbonyl-ethyl) 1-ethoxycarbonylmethy-3-ethyl-1,2,3,4-tetrahydro-4-oxo-1,3,2-benzodiazaphosphorin-2-carbox amide 2-oxide, (C19H_26N3O7P, Mr = 439.41), was determined by single crystal X-ray diffraction at 299(1) K. It crystallizes in the triclinic system, space group P (No.2) with a = 8.955(2), b = 11.863(2), c = 12.309(2) ?, ( = 62.67(3),β= 68.10(3), ( = 78.07(3)(, V = 1077(1) ?3, Z = 2, Dx =1.355 g·cm－3, ( = 0.71073 ?, ( = 0.1657 mm－1 and F(000) = 464. The structure was solved by direct methods. The final R factor is 0.071 and Rw is 0.076 for 2176 observed reflections with I ≥3((I). The results from X-ray crystallography analysis of the isomer with 31P NMR spectra exhibited as ( 4.09 show that the absolute configuration of the chiral phosphorus atom at P(1) was proved to be S-form, with reference to the known configuration of R-alanine moiety.
The crystal structure of the title compound N- (1-ethoxycarbonyl-ethyl) 1-ethoxycarbonylmethy-3-ethyl- 1,2,3,4-tetrahydro- 4-oxo-1,3,2-benzodiazaphosphorin-2-carboxamide 2-oxide, (C19H_26N3O7P, Mr = 439.41), was determined by single crystal X-ray diffraction at 299 K. K. Crystallizes in the triclinic system, space group P (No.2) with a = 8.955 (2) , b = 11.863 (2), c = 12.309 (2) ?, (= 62.67 (3),? = 68.10 (3), (= 78.07 , Dx = 1.355 g-cm-3, (= 0.71073 ?, (= 0.1657 mm-1 and F (000) = 464. The final R factor is 0.071 and Rw is 0.076 for 2176 observed reflections with I ≥ 3 ((I). The results from X-ray crystallography analysis of the isomer with 31P NMR spectra exhibited as (4.09 show that the absolute configuration of the chiral phosphorus atom at P (1) was proved to be S- form, with reference to the known configuration of R-alanine moiety.