Organocatalytic enantioselective construction of nitrocyclohexanes containing multiple chiral centres via a cascade reaction
Rajkumar, Sundaram; Shankland, Kenneth; Brown, Geoffrey D.; Cobb, Alexander J. A.; Chemical Science 3 (2012) 584–; doi:10.1039/c1sc00592h

data_1514977
_publ_section_title
;
 Organocatalytic enantioselective construction of nitrocyclohexanes
 containing multiple chiral centres via a cascade reaction
;
_journal_issue                   2
_journal_name_full               'Chemical Science'
_journal_page_first              584
_journal_paper_doi               10.1039/c1sc00592h
_journal_volume                  3
_journal_year                    2012
_chemical_absolute_configuration syn
_chemical_formula_sum            'C18 H24 N2 O7'
_chemical_formula_weight         380.39
_chemical_name_systematic
;
Ethyl 2(R)-[3(R)-(4'-methoxy-phenyl)-2(R),4(S)-dinitro-1(R)cyclohexyl]
propanoate
;
_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                   5.5811(5)
_cell_length_b                   12.5943(15)
_cell_length_c                   26.723(4)
_cell_measurement_reflns_used    797
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      62.8276
_cell_measurement_theta_min      3.3049
_cell_volume                     1878.4(4)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 16.2086
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Gemini ultra'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'Enhance Ultra (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0513
_diffrn_reflns_av_sigmaI/netI    0.0924
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -3
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            4528
_diffrn_reflns_theta_full        62.92
_diffrn_reflns_theta_max         62.92
_diffrn_reflns_theta_min         3.31
_exptl_absorpt_coefficient_mu    0.875
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.40184
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.345
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             808
_exptl_crystal_preparation       'heptane / DCM'
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.255
_refine_diff_density_min         -0.302
_refine_diff_density_rms         0.055
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.2(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.919
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         2674
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.919
_refine_ls_R_factor_all          0.0992
_refine_ls_R_factor_gt           0.0512
_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^)+(0.0496P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0983
_refine_ls_wR_factor_ref         0.1169
_reflns_number_gt                1667
_reflns_number_total             2674
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c1sc00592h.txt
_cod_data_source_block           Crystal13
_cod_database_code               1514977