Organocatalytic Cloke-Wilson Rearrangement: DABCO-Catalyzed Ring Expansion of Cyclopropyl Ketones to 2,3-Dihydrofurans.
Zhang, Jingfang; Tang, Yuhai; Wei, Wen; Wu, Yong; Li, Yang; Zhang, Junjie; Zheng, Yuansuo; Xu, Silong; Organic letters 19 (2017) 3043–3046; doi:10.1021/acs.orglett.7b00805

data_1556037
_publ_section_title
;
 Organocatalytic Cloke-Wilson Rearrangement: DABCO-Catalyzed Ring
 Expansion of Cyclopropyl Ketones to 2,3-Dihydrofurans.
;
_journal_issue                   12
_journal_name_full               'Organic letters'
_journal_page_first              3043
_journal_page_last               3046
_journal_paper_doi               10.1021/acs.orglett.7b00805
_journal_volume                  19
_journal_year                    2017
_chemical_absolute_configuration s
_chemical_formula_moiety         'C23 H18 O2'
_chemical_formula_sum            'C23 H18 O2'
_chemical_formula_weight         326.37
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21 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                 96.951(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.0965(3)
_cell_length_b                   7.8294(3)
_cell_length_c                   17.9271(8)
_cell_measurement_reflns_used    5399
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      26.34
_cell_measurement_theta_min      2.84
_cell_volume                     849.41(7)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0630
_diffrn_reflns_av_sigmaI/netI    0.0724
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            9040
_diffrn_reflns_theta_full        26.41
_diffrn_reflns_theta_max         26.41
_diffrn_reflns_theta_min         3.37
_exptl_absorpt_coefficient_mu    0.080
_exptl_absorpt_correction_T_max  0.9841
_exptl_absorpt_correction_T_min  0.9818
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            COLORLESS
_exptl_crystal_density_diffrn    1.276
_exptl_crystal_density_meas      1.276
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       LUMP
_exptl_crystal_F_000             344
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.289
_refine_diff_density_min         -0.376
_refine_diff_density_rms         0.090
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(17)
_refine_ls_extinction_coef       0.167(18)
_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   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     227
_refine_ls_number_reflns         3443
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0649
_refine_ls_R_factor_gt           0.0523
_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^)+(0.0621P)^2^+0.4883P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1331
_refine_ls_wR_factor_ref         0.1389
_reflns_number_gt                3124
_reflns_number_total             3443
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol7b00805_si_002.cif
_cod_data_source_block           ljj_20161229_0m
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'MULTI-SCAN' was
changed to 'multi-scan' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

data item '_refine_ls_hydrogen_treatment' value 'CONSTR' was changed
to 'constr' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               1556037