Asymmetric Synthesis of α,α-Disubstituted α-Amino Acids by Diastereoselective Alkylation of Camphor-Based Tricyclic Iminolactone
Peng-Fei Xu; Shuo Li; Ta-Jung Lu; Chen-Chang Wu; Botao Fan; Georgia Golfis; Journal of Organic Chemistry 71 (2006) 4364–4373; doi:10.1021/jo052435g

data_4021710
_publ_section_title
;
 Asymmetric Synthesis of \a,\a-Disubstituted \a-Amino Acids
 by Diastereoselective Alkylation of Camphor-Based Tricyclic
 Iminolactone
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              4364
_journal_page_last               4373
_journal_paper_doi               10.1021/jo052435g
_journal_volume                  71
_journal_year                    2006
_chemical_formula_sum            'C20 H25 N O2'
_chemical_formula_weight         311.41
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.2797(11)
_cell_length_b                   11.9022(11)
_cell_length_c                   13.0227(12)
_cell_measurement_temperature    293(2)
_cell_volume                     1748.3(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0264
_diffrn_reflns_av_sigmaI/netI    0.0253
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            9886
_diffrn_reflns_theta_full        26.04
_diffrn_reflns_theta_max         26.04
_diffrn_reflns_theta_min         2.32
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.183
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             672
_refine_diff_density_max         0.136
_refine_diff_density_min         -0.099
_refine_diff_density_rms         0.025
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.1(13)
_refine_ls_extinction_coef       0.023(3)
_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   0.826
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     209
_refine_ls_number_reflns         3436
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.826
_refine_ls_R_factor_all          0.0442
_refine_ls_R_factor_gt           0.0336
_refine_ls_shift/su_max          0.011
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1008
_refine_ls_wR_factor_ref         0.1129
_reflns_number_gt                2837
_reflns_number_total             3436
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo052435gsi20051124_093930.cif
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_database_code               4021710