Asymmetric direct vinylogous Michael reaction of activated alkenes to nitroolefins catalyzed by modified cinchona alkaloids.
Xue, Dong; Chen, Ying-Chun; Wang, Qi-Wei; Cun, Ling-Feng; Zhu, Jin; Deng, Jin-Gen; Organic letters 7 (2005) 5293–5296; doi:10.1021/ol052283b

data_1506762
_publ_section_title
;
 Asymmetric direct vinylogous Michael reaction of activated alkenes to
 nitroolefins catalyzed by modified cinchona alkaloids.
;
_journal_issue                   23
_journal_name_full               'Organic letters'
_journal_page_first              5293
_journal_page_last               5296
_journal_paper_doi               10.1021/ol052283b
_journal_volume                  7
_journal_year                    2005
_chemical_formula_sum            'C22 H19 N3 O3'
_chemical_formula_weight         373.40
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 91.76(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.074(1)
_cell_length_b                   15.601(2)
_cell_length_c                   17.909(3)
_cell_measurement_reflns_used    28
_cell_measurement_temperature    287(2)
_cell_measurement_theta_max      12.98
_cell_measurement_theta_min      2.62
_cell_volume                     1975.5(5)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      287(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0161
_diffrn_reflns_av_sigmaI/netI    0.0450
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            4293
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         1.73
_diffrn_standards_decay_%        2.49
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.255
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.32
_refine_diff_density_max         0.118
_refine_diff_density_min         -0.135
_refine_diff_density_rms         0.030
_refine_ls_extinction_coef       0.0193(13)
_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   0.878
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         3679
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.878
_refine_ls_R_factor_all          0.0858
_refine_ls_R_factor_gt           0.0416
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0510P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0928
_refine_ls_wR_factor_ref         0.1048
_reflns_number_gt                2007
_reflns_number_total             3679
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol052283bsi20050921_060818.cif
_cod_data_source_block           y1892
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1975.51(55)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1506762