A Dual Lewis Base Activation Strategy for Enantioselective Carbene-Catalyzed Annulations
Javier Izquierdo; Ane Orue; Karl A. Scheidt; Journal of the American Chemical Society 135 (2013) 10634–10637; doi:10.1021/ja405833m

data_4120167
_publ_section_title
;
 A Dual Lewis Base Activation Strategy for Enantioselective
 Carbene-Catalyzed Annulations
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10634
_journal_page_last               10637
_journal_paper_doi               10.1021/ja405833m
_journal_volume                  135
_journal_year                    2013
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C17 H16 O2'
_chemical_formula_sum            'C17 H16 O2'
_chemical_formula_weight         252.30
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_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_date             2013-05-12
_audit_creation_method
;
  Olex2 1.2
  (compiled Apr 23 2013 17:59:47, GUI svn.r4466)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.9141(3)
_cell_length_b                   12.8128(6)
_cell_length_c                   17.2988(8)
_cell_measurement_reflns_used    9908
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      64.846
_cell_measurement_theta_min      3.450
_cell_volume                     1310.84(11)
_computing_data_reduction        'SAINT v8.27A (Bruker, 2012)'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement
;
XL, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_computing_structure_solution
;
XS, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_diffrn_ambient_temperature      99.99
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0223
_diffrn_reflns_av_unetI/netI     0.0129
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            15195
_diffrn_reflns_theta_full        64.96
_diffrn_reflns_theta_max         64.96
_diffrn_reflns_theta_min         4.29
_diffrn_source                   'fine-focus sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.655
_exptl_absorpt_correction_T_max  0.7526
_exptl_absorpt_correction_T_min  0.6300
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2012/1 (Bruker,2012) was used for absorption correction.
wR2(int) was 0.1305 before and 0.0421 after correction.
The Ratio of minimum to maximum transmission is 0.8371.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.278
_exptl_crystal_description       rod
_exptl_crystal_F_000             536
_exptl_crystal_size_max          0.752
_exptl_crystal_size_mid          0.276
_exptl_crystal_size_min          0.194
_refine_diff_density_max         0.192
_refine_diff_density_min         -0.245
_refine_diff_density_rms         0.076
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.233
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         2182
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.233
_refine_ls_R_factor_all          0.0237
_refine_ls_R_factor_gt           0.0218
_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^)+(0.0472P)^2^+0.1556P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0645
_refine_ls_wR_factor_ref         0.0781
_reflns_number_gt                2179
_reflns_number_total             2182
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja405833m_si_002.cif
_cod_data_source_block           jizquierdo07_94_0m
_cod_database_code               4120167
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C3(H3), C4(H4)
2.b Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B)
2.c Aromatic/amide H refined with riding coordinates:
 C7(H7), C8(H8), C9(H9), C10(H10), C13(H13), C14(H14), C15(H15), C16(H16),
 C17(H17)
2.d Idealised Me refined as rotating group:
 C11(H11A,H11B,H11C)
;