Diastereo- and enantioselective synthesis of alpha,gamma-diaminobutyric acid derivatives via Cu-catalyzed asymmetric Michael reaction.
Li, Qing; Ding, Chang-Hua; Hou, Xue-Long; Dai, Li-Xin; Organic letters 12 (2010) 1080–1083; doi:10.1021/ol100060t

data_1502842
_publ_section_title
;
 Diastereo- and enantioselective synthesis of alpha,gamma-diaminobutyric
 acid derivatives via Cu-catalyzed asymmetric Michael reaction.
;
_journal_issue                   5
_journal_name_full               'Organic letters'
_journal_page_first              1080
_journal_page_last               1083
_journal_paper_doi               10.1021/ol100060t
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration ad
_chemical_formula_sum            'C14 H19 Br N2 O4'
_chemical_formula_weight         359.22
_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                   5.8600(6)
_cell_length_b                   15.3822(15)
_cell_length_c                   18.6383(18)
_cell_measurement_reflns_used    1479
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      39.369
_cell_measurement_theta_min      5.111
_cell_volume                     1680.1(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 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0684
_diffrn_reflns_av_sigmaI/netI    0.0948
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            9228
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         1.72
_exptl_absorpt_coefficient_mu    2.462
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.75347
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.420
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.356
_exptl_crystal_size_mid          0.081
_exptl_crystal_size_min          0.044
_refine_diff_density_max         0.342
_refine_diff_density_min         -0.365
_refine_diff_density_rms         0.049
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.032(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.922
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     193
_refine_ls_number_reflns         3282
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.922
_refine_ls_R_factor_all          0.0907
_refine_ls_R_factor_gt           0.0462
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
; calc 
 [0.00000+1.00000exp(2.00(sin\q/\l)^2^)]/ 
   [\s^2^(Fo^2^)+0.0000+0.0000*P+(0.0384P)^2^+0.0000sin\q/\l] 
 where P = 0.33333Fo^2^ + 0.66667Fc^2^ 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0898
_refine_ls_wR_factor_ref         0.1022
_reflns_number_gt                1710
_reflns_number_total             3282
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol100060t_si_002.cif
_cod_data_source_block           cd29190
_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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1502842