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_1506759
_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            'C19 H19 N O2'
_chemical_formula_weight         293.35
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   10.162(2)
_cell_length_b                   11.205(2)
_cell_length_c                   27.271(5)
_cell_measurement_reflns_used    26
_cell_measurement_temperature    300(2)
_cell_measurement_theta_max      13.57
_cell_measurement_theta_min      2.50
_cell_volume                     3105.2(10)
_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      300(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  0.0088
_diffrn_reflns_av_sigmaI/netI    0.0646
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            3497
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         1.49
_diffrn_standards_decay_%        3.61
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.255
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1248
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.132
_refine_diff_density_min         -0.135
_refine_diff_density_rms         0.031
_refine_ls_extinction_coef       0.0034(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   0.847
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     201
_refine_ls_number_reflns         2895
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.847
_refine_ls_R_factor_all          0.1027
_refine_ls_R_factor_gt           0.0412
_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^)+(0.0326P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0766
_refine_ls_wR_factor_ref         0.0896
_reflns_number_gt                1405
_reflns_number_total             2895
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol052283bsi20050921_060650.cif
_cod_data_source_block           y1939
_cod_depositor_comments
;
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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        3105.4(10)
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               1506759