Asymmetric Friedel-Crafts Alkylation of α-Substituted β-Nitroacrylates: Access to β(2,2)-Amino Acids Bearing Indolic All-Carbon Quaternary Stereocenters
Weng, Jian-Quan; Deng, Qiao-Man; Wu, Liang; Xu, Kai; Wu, Hao; Liu, Ren-Rong; Gao, Jian-Rong; Jia, Yi-Xia; Organic Letters 16 (2014) 776–779; doi:10.1021/ol403480v

data_1514260
_publ_section_title
;
 Asymmetric Friedel-Crafts Alkylation of \a-Substituted \b-Nitroacrylates:
 Access to \b(2,2)-Amino Acids Bearing Indolic All-Carbon Quaternary
 Stereocenters
;
_journal_coden_ASTM              ORLEF7
_journal_issue                   3
_journal_name_full               'Organic Letters'
_journal_page_first              776
_journal_page_last               779
_journal_paper_doi               10.1021/ol403480v
_journal_volume                  16
_journal_year                    2014
_chemical_formula_sum            'C28 H28 N2 O2'
_chemical_formula_weight         424.52
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                86.612(5)
_cell_angle_beta                 87.077(4)
_cell_angle_gamma                84.894(4)
_cell_formula_units_Z            2
_cell_length_a                   9.3592(4)
_cell_length_b                   9.8580(7)
_cell_length_c                   13.1796(7)
_cell_measurement_temperature    293(2)
_cell_volume                     1207.77(12)
_computing_cell_refinement       CrysAlisPro
_computing_data_collection       CrysAlisPro
_computing_data_reduction        CrysAlisPro
_computing_molecular_graphics    'SHELXL-97 (Sheldrick, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0199
_diffrn_reflns_av_sigmaI/netI    0.0458
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            9793
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         3.10
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9819
_exptl_absorpt_correction_T_min  0.9783
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_density_diffrn    1.167
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             452
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.238
_refine_diff_density_min         -0.176
_refine_diff_density_rms         0.030
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     577
_refine_ls_number_reflns         7278
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0708
_refine_ls_R_factor_gt           0.0490
_refine_ls_shift/su_max          0.020
_refine_ls_shift/su_mean         0.003
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0589P)^2^+0.0406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1064
_refine_ls_wR_factor_ref         0.1199
_reflns_number_gt                5570
_reflns_number_total             7278
_reflns_threshold_expression     >2sigma(I)
_cod_duplicate_entry             1513483
_cod_data_source_file            ol403480v_si_003.cif
_cod_data_source_block           p
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to
/usr/data/users/saulius/automatic-downloads/current/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

 Updated bibliographic information.

 Antanas Vaitkus,
 2019-09-20

 Marked entry as a duplicate of entry 1513483.

 Antanas Vaitkus,
 2019-09-20

2025-01-26
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_formula_sum            'C56 H56 N4 O4'
_cod_original_formula_weight         849.05
_cod_original_formula_units_Z            1
_cod_original_sg_symbol_H-M      'P1   '
_cod_database_code               1514260