Amine-Catalyzed Asymmetric (3 + 3) Annulations of β'-Acetoxy Allenoates: Enantioselective Synthesis of 4H-Pyrans.
Ni, Chunjie; Tong, Xiaofeng; Journal of the American Chemical Society 138 (2016) 7872–7875; doi:10.1021/jacs.6b04935

data_4130586
_publ_section_title
;
 Amine-Catalyzed Asymmetric (3 + 3) Annulations of \b'-Acetoxy Allenoates:
 Enantioselective Synthesis of 4H-Pyrans.
;
_journal_issue                   25
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7872
_journal_page_last               7875
_journal_paper_doi               10.1021/jacs.6b04935
_journal_volume                  138
_journal_year                    2016
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C21 H17 N O3'
_chemical_formula_sum            'C21 H17 N O3'
_chemical_formula_weight         331.36
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2015-01-15
_audit_creation_method
;
Olex2 1.2
(compiled 2014.07.22 svn.r2960 for OlexSys, GUI svn.r4862)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.57200(10)
_cell_length_b                   11.03350(10)
_cell_length_c                   17.8845(2)
_cell_measurement_reflns_used    9065
_cell_measurement_temperature    130
_cell_measurement_theta_max      69.28
_cell_measurement_theta_min      4.71
_cell_volume                     1691.50(3)
_computing_cell_refinement       'SAINT v7.68A (Bruker, 2009)'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      130.0
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.992
_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  0.0306
_diffrn_reflns_av_unetI/netI     0.0224
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.992
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            13682
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.985
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         69.779
_diffrn_reflns_theta_min         4.709
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.706
_exptl_absorpt_correction_T_max  0.7533
_exptl_absorpt_correction_T_min  0.6422
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.0921 before and 0.0416 after correction.
The Ratio of minimum to maximum transmission is 0.8525.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.301
_exptl_crystal_description       block
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.188
_refine_diff_density_min         -0.169
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details
;
 Flack x determined using 1298 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.15(6)
_refine_ls_extinction_coef       0.0186(10)
_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   1.072
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     229
_refine_ls_number_reflns         3146
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0282
_refine_ls_R_factor_gt           0.0280
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0435P)^2^+0.2486P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0738
_refine_ls_wR_factor_ref         0.0740
_reflns_Friedel_coverage         0.719
_reflns_Friedel_fraction_full    0.995
_reflns_Friedel_fraction_max     0.975
_reflns_number_gt                3128
_reflns_number_total             3146
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja6b04935_si_002.cif
_cod_data_source_block           cu_dm15056_0m
_cod_database_code               4130586
_shelxl_version_number           2014-3
_shelx_estimated_absorpt_t_max   0.920
_shelx_estimated_absorpt_t_min   0.872
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C1(H1)
2.b Aromatic/amide H refined with riding coordinates:
 C11(H11), C12(H12), C13(H13), C14(H14), C15(H15), C17(H17), C18(H18),
 C19(H19), C20(H20), C21(H21)
2.c Idealised Me refined as rotating group:
 C7(H7A,H7B,H7C), C8(H8A,H8B,H8C)
;
_shelx_res_checksum              17746
_shelx_hkl_checksum              11100
_olex2_submission_special_instructions 'No special instructions were received'