Catalytic Asymmetric [4+2]-Cycloaddition of Ortho-Alkenyl Naphthols/Phenols with Ortho-Quinone Methides: Highly Stereoselective Synthesis of Chiral 2,3,4-Trisubstituted Chromans.
Feng, Shubo; Yang, Binmiao; Chen, Tao; Wang, Ran; Deng, Yu-Hua; Shao, ZhiHui; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.9b03302

data_4038176
_publ_section_title
;
 Catalytic Asymmetric [4+2]-Cycloaddition of Ortho-Alkenyl
 Naphthols/Phenols with Ortho-Quinone Methides: Highly Stereoselective
 Synthesis of Chiral 2,3,4-Trisubstituted Chromans.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.9b03302
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C29 H26 O4'
_chemical_formula_sum            'C29 H26 O4'
_chemical_formula_weight         438.50
_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
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   14.4047(3)
_cell_length_b                   15.9977(3)
_cell_length_c                   19.8734(4)
_cell_measurement_reflns_used    9757
_cell_measurement_temperature    100.(2)
_cell_measurement_theta_max      72.2730
_cell_measurement_theta_min      3.5467
_cell_volume                     4579.67(16)
_computing_cell_refinement       'SAINT V8.38A (Bruker AXS Inc., 2017)'
_computing_data_collection       'Bruker Instrument Service vV6.2.9'
_computing_data_reduction        'SAINT V8.38A (Bruker AXS Inc., 2017)'
_computing_molecular_graphics    'shelXle (C.B. Huebschle, rev 882)'
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100.(2)
_diffrn_detector_area_resol_mean 7.3910
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker D8 QUEST PHOTON II'
_diffrn_radiation_monochromator  'Helixos MX multilayer Optic'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0410
_diffrn_reflns_av_unetI/netI     0.0243
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            53020
_diffrn_reflns_theta_full        72.36
_diffrn_reflns_theta_max         72.36
_diffrn_reflns_theta_min         3.55
_diffrn_source                   'Ius Diamond'
_diffrn_source_type              Microfocus
_exptl_absorpt_coefficient_mu    0.671
_exptl_absorpt_correction_T_max  0.89
_exptl_absorpt_correction_T_min  0.77
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 - Bruker AXS area detector scaling and absorption correction
;
_exptl_crystal_colour            'translucent light colourless'
_exptl_crystal_density_diffrn    1.272
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1856
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.250
_exptl_crystal_size_min          0.170
_refine_diff_density_max         0.225
_refine_diff_density_min         -0.207
_refine_ls_abs_structure_details
;

Flack x determined using 3950 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.01(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     612
_refine_ls_number_reflns         9062
_refine_ls_number_restraints     38
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0284
_refine_ls_R_factor_gt           0.0279
_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^)+(0.0388P)^2^+0.7211P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0700
_refine_ls_wR_factor_ref         0.0703
_reflns_number_gt                8930
_reflns_number_total             9062
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b03302_si_004.cif
_cod_data_source_block           szh_fsb1
_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/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/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 7556 2019-12-06 15:28:31Z antanas 
;
_cod_database_code               4038176
_shelx_res_checksum              75903
_shelx_hkl_checksum              22909