Nine-step total synthesis of (-)-strychnofoline.
Yu, Qingzhen; Guo, Pan; Jian, Jie; Chen, Yuye; Xu, Jing; Chemical communications (Cambridge, England) 54 (2018) 1125–1128; doi:10.1039/c7cc08938d

data_7121113
_publ_section_title
;
 Nine-step total synthesis of (-)-strychnofoline.
;
_journal_issue                   9
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              1125
_journal_page_last               1128
_journal_paper_doi               10.1039/c7cc08938d
_journal_volume                  54
_journal_year                    2018
_chemical_absolute_configuration ad
_chemical_compound_source        N/A
_chemical_formula_moiety         'C20 H22 N2 O4'
_chemical_formula_sum            'C20 H22 N2 O4'
_chemical_formula_weight         354.39
_chemical_melting_point          ?
_chemical_name_common            YQZ-132-A
_chemical_name_systematic
(3S,4a'R,5a'S)-6-methoxy-1'-methyl-4',4a',5',5a',7',8'-hexahydro-3'H,10'H-spiro[indoline-3,6'-pyrano[3,4-f]indolizine]-2,10'-dione
_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     dual
_audit_creation_date             2017-08-28
_audit_creation_method
;
Olex2 1.2
(compiled 2017.08.10 svn.r3458 for OlexSys, GUI svn.r5375)
;
_audit_update_record
;
2017-08-28 deposited with the CCDC.
2018-01-08 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.4100(4)
_cell_length_b                   12.0057(9)
_cell_length_c                   22.2391(15)
_cell_measurement_reflns_used    9980
_cell_measurement_temperature    170
_cell_measurement_theta_max      68.21
_cell_measurement_theta_min      3.68
_cell_volume                     1711.4(2)
_computing_cell_refinement       'SAINT v8.37A (Bruker, 2015)'
_computing_data_reduction        'SAINT v8.37A (Bruker, 2015)'
_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    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      170.0
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0246
_diffrn_reflns_av_unetI/netI     0.0218
_diffrn_reflns_Laue_measured_fraction_full 0.986
_diffrn_reflns_Laue_measured_fraction_max 0.986
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            10789
_diffrn_reflns_point_group_measured_fraction_full 0.989
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.200
_diffrn_reflns_theta_min         7.020
_exptl_absorpt_coefficient_mu    0.789
_exptl_absorpt_correction_T_max  0.7531
_exptl_absorpt_correction_T_min  0.6596
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1006 before and 0.0397 after correction. The Ratio of minimum to maximum transmission is 0.8758. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.375
_exptl_crystal_description       block
_exptl_crystal_F_000             752
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: Ethyl acetate'
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.182
_refine_diff_density_min         -0.159
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details
;
 Flack x determined using 1280 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.03(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     237
_refine_ls_number_reflns         3106
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.089
_refine_ls_R_factor_all          0.0313
_refine_ls_R_factor_gt           0.0311
_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^)+(0.0463P)^2^+0.3085P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0817
_refine_ls_wR_factor_ref         0.0819
_reflns_Friedel_coverage         0.716
_reflns_Friedel_fraction_full    0.992
_reflns_Friedel_fraction_max     0.992
_reflns_number_gt                3082
_reflns_number_total             3106
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7cc08938d2.cif
_cod_data_source_block           p212121_a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value 'N/A' was changed to '?' - the value
is undefined or not given.

Automatic conversion script
Id: cif_fix_values 4973 2017-02-22 13:04:09Z antanas 

 Adding full bibliography for 7121113.cif.
;
_cod_database_code               7121113
_shelx_shelxl_version_number     2014/7
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All N(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C12(H12), C14(H14)
2.b Secondary CH2 refined with riding coordinates:
 C10(H10A,H10B), C11(H11A,H11B), C13(H13A,H13B), C15(H15A,H15B), C16(H16A,H16B)
2.c Aromatic/amide H refined with riding coordinates:
 N2(H2), C3(H3), C6(H6), C7(H7)
2.d Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C), C17(H17A,H17B,H17C)
;
_shelx_res_checksum              41795
_olex2_submission_special_instructions 'No special instructions were received'