Asymmetric Michael additions of α-cyanoacetates by soft Lewis acid/hard Brønsted acid catalysis: stereodivergency with bi- vs. monometallic catalysts
Eitel, Simon H.; Jautze, Sascha; Frey, Wolfgang; Peters, René; Chemical Science 4 (2013) 2218–; doi:10.1039/c3sc50419k

data_1514699
_publ_section_title
;
 Asymmetric Michael additions of \a-cyanoacetates by soft Lewis acid/hard
 Br\/onsted acid catalysis: stereodivergency with bi- vs. monometallic
 catalysts
;
_journal_issue                   5
_journal_name_full               'Chemical Science'
_journal_page_first              2218
_journal_paper_doi               10.1039/c3sc50419k
_journal_volume                  4
_journal_year                    2013
_chemical_formula_moiety         'C19 H25 N O3'
_chemical_formula_sum            'C19 H25 N O3'
_chemical_formula_weight         315.40
_chemical_name_systematic
;
tert-Butyl-2-cyano-2-(3-hydroxycyclohexyl)-2-phenylacetate
;
_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                 110.477(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.0052(5)
_cell_length_b                   19.3148(11)
_cell_length_c                   11.0511(7)
_cell_measurement_reflns_used    3003
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      6652
_cell_measurement_theta_min      4.58
_cell_volume                     1800.70(18)
_computing_cell_refinement       'Bruker APEX II Software Suite, 2008'
_computing_data_collection       'Bruker APEX II Software Suite, 2008'
_computing_data_reduction        'Bruker APEX II Software Suite, 2008'
_computing_molecular_graphics    'SHELXTL-plus, XP (Sheldrick, 1991)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.965
_diffrn_measured_fraction_theta_max 0.966
_diffrn_measurement_device_type  'Bruker Kappa APEXII Duo'
_diffrn_measurement_method       'Omega + Phi Scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         I\mS
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0258
_diffrn_reflns_av_sigmaI/netI    0.0144
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            17943
_diffrn_reflns_theta_full        66.52
_diffrn_reflns_theta_max         66.52
_diffrn_reflns_theta_min         4.58
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.624
_exptl_absorpt_correction_T_max  0.7526
_exptl_absorpt_correction_T_min  0.6657
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, 1995'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.163
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.49
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.480
_refine_diff_density_min         -0.194
_refine_diff_density_rms         0.035
_refine_ls_extinction_coef       0.00137(19)
_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   1.061
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     213
_refine_ls_number_reflns         3067
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0379
_refine_ls_R_factor_gt           0.0365
_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^)+(0.0341P)^2^+0.9396P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0877
_refine_ls_wR_factor_ref         0.0889
_reflns_number_gt                3003
_reflns_number_total             3067
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3sc50419k.txt
_cod_data_source_block           s1844lc2
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1514699