Asymmetric synthesis of multiple quaternary stereocentre-containing cyclopentyls by oxazolidinone-promoted Nazarov cyclizations.
Volpe, Rohan; Lepage, Romain J.; White, Jonathan M.; Krenske, Elizabeth H.; Flynn, Bernard L.; Chemical science 9 (2018) 4644–4649; doi:10.1039/c8sc00031j

data_1549270
_publ_section_title
;
 Asymmetric synthesis of multiple quaternary stereocentre-containing
 cyclopentyls by oxazolidinone-promoted Nazarov cyclizations.
;
_journal_issue                   20
_journal_name_full               'Chemical science'
_journal_page_first              4644
_journal_page_last               4649
_journal_paper_doi               10.1039/c8sc00031j
_journal_volume                  9
_journal_year                    2018
_chemical_absolute_configuration rm
_chemical_formula_sum            'C32 H33 N O3'
_chemical_formula_weight         479.59
_space_group_crystal_system      trigonal
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_space_group_name_Hall           'P 31 2"'
_space_group_name_H-M_alt        'P 31 2 1'
_symmetry_space_group_name_Hall  'P 31 2"'
_symmetry_space_group_name_H-M   'P 31 2 1'
_atom_sites_solution_hydrogens   geom
_audit_block_doi                 10.5517/ccdc.csd.cc1yx8bg
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_audit_update_record
;
2018-01-04 deposited with the CCDC.
2018-04-20 downloaded from the CCDC.
;
_cell_angle_alpha                90
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_cell_angle_gamma                120
_cell_formula_units_Z            6
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_computing_cell_refinement       'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      130.01(10)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 10.2273
_diffrn_detector_type            Atlas
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
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_diffrn_reflns_av_R_equivalents  0.0510
_diffrn_reflns_av_unetI/netI     0.0527
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_diffrn_reflns_Laue_measured_fraction_max 0.975
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       42
_diffrn_reflns_limit_l_min       -50
_diffrn_reflns_number            52026
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.963
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         36.461
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_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Mo) X-ray Source'
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_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.43 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.230
_exptl_crystal_description       slab
_exptl_crystal_F_000             1536
_exptl_crystal_size_max          0.662
_exptl_crystal_size_mid          0.645
_exptl_crystal_size_min          0.161
_refine_diff_density_max         0.254
_refine_diff_density_min         -0.264
_refine_diff_density_rms         0.051
_refine_ls_abs_structure_details
;
 Flack x determined using 2978 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.3(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     329
_refine_ls_number_reflns         12232
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0879
_refine_ls_R_factor_gt           0.0546
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0507P)^2^+0.9080P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1232
_refine_ls_wR_factor_ref         0.1439
_reflns_Friedel_coverage         0.783
_reflns_Friedel_fraction_full    0.999
_reflns_Friedel_fraction_max     0.949
_reflns_number_gt                8765
_reflns_number_total             12232
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8sc00031j2.cif
_cod_data_source_block           shelx
_cod_depositor_comments
'Adding full bibliography for 1549270--1549271.cif.'
_cod_original_cell_volume        3885.8(3)
_cod_database_code               1549270
_shelx_shelxl_version_number     2016/6
_chemical_oxdiff_usercomment     'Bernie Flynn RV-17.3'
_oxdiff_exptl_absorpt_empirical_full_min 0.492
_oxdiff_exptl_absorpt_empirical_full_max 11.731
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_shelx_res_checksum              1002
_shelx_hkl_checksum              51654