A concise route to beta-Cyclopropyl amino acids utilizing 1,2-dioxines and stabilized phosphonate nucleophiles.
Avery, Thomas D.; Greatrex, Ben W.; Pedersen, Daniel Sejer; Taylor, Dennis K.; Tiekink, Edward R. T.; The Journal of organic chemistry 73 (2008) 2633–2640; doi:10.1021/jo7024256

data_4029550
_publ_section_title
;
 A concise route to beta-Cyclopropyl amino acids utilizing 1,2-dioxines
 and stabilized phosphonate nucleophiles.
;
_journal_issue                   7
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              2633
_journal_page_last               2640
_journal_paper_doi               10.1021/jo7024256
_journal_volume                  73
_journal_year                    2008
_chemical_formula_moiety         'C21 H21 N O5'
_chemical_formula_sum            'C21 H21 N O5'
_chemical_formula_weight         367.39
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_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
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_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
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_cell_angle_beta                 75.382(14)
_cell_angle_gamma                83.256(15)
_cell_formula_units_Z            4
_cell_length_a                   10.362(3)
_cell_length_b                   12.880(4)
_cell_length_c                   14.775(4)
_cell_measurement_reflns_used    6829
_cell_measurement_temperature    150(2)
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_cell_measurement_theta_min      2.4
_cell_volume                     1854.0(9)
_computing_cell_refinement       'SAINT (Bruker, 2000)'
_computing_data_collection       'SMART (Bruker, 2000)'
_computing_data_reduction        'SHELXTL (Bruker, 2000)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1993)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker AXS SMART CCD diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_limit_l_min       -18
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_diffrn_reflns_theta_max         26.5
_diffrn_reflns_theta_min         2.2
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_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.981
_exptl_absorpt_correction_T_min  0.972
_exptl_absorpt_correction_type   multi-scan
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_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.316
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
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_exptl_crystal_size_max          0.30
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_refine_ls_extinction_coef       0.0097(14)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.13
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     536
_refine_ls_number_reflns         7671
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.13
_refine_ls_R_factor_all          0.071
_refine_ls_R_factor_gt           0.070
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0690P)^2^+1.1068P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            jo7024256-file003.cif
_cod_data_source_block           26b
_cod_original_cell_volume        1854.0(10)
_cod_database_code               4029550