(-)-Cytisine: Access to a stereochemically defined and functionally flexible piperidine scaffold.
Niwetmarin, Worawat; Rego Campello, Hugo; Sparkes, Hazel A.; Aggarwal, Varinder K.; Gallagher, Timothy; Organic & biomolecular chemistry 16 (2018) 5823–5832; doi:10.1039/c8ob01456f

data_7156327
_publ_section_title
;
 (-)-Cytisine: Access to a stereochemically defined and functionally
 flexible piperidine scaffold.
;
_journal_issue                   32
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              5823
_journal_page_last               5832
_journal_paper_doi               10.1039/c8ob01456f
_journal_volume                  16
_journal_year                    2018
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C21 H32 N2 O6'
_chemical_formula_sum            'C21 H32 N2 O6'
_chemical_formula_weight         408.48
_space_group_crystal_system      tetragonal
_space_group_IT_number           77
_space_group_name_Hall           'P 4c'
_space_group_name_H-M_alt        'P 42'
_symmetry_space_group_name_Hall  'P 4c'
_symmetry_space_group_name_H-M   'P 42'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     iterative
_audit_creation_date             2017-08-14
_audit_creation_method
;
Olex2 1.2
(compiled 2017.08.10 svn.r3458 for OlexSys, GUI svn.r5375)
;
_audit_update_record
;
2018-04-27 deposited with the CCDC.
2018-07-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   27.1192(8)
_cell_length_b                   27.1192(8)
_cell_length_c                   6.0742(2)
_cell_measurement_reflns_used    4582
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      21.10
_cell_measurement_theta_min      2.25
_cell_volume                     4467.3(2)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_collection       'Bruker Apex suite'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution
;
Superflip (Palatinus & Chapuis, 2007;Palatinus & van der Lee, 2008;
Palatinus et al., 2012)
;
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'Bruker area detector'
_diffrn_detector_type            'CCD area detector'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       'Bruker Apex II kappa CCD area detector'
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0711
_diffrn_reflns_av_unetI/netI     0.0640
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -33
_diffrn_reflns_limit_k_max       33
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            37067
_diffrn_reflns_point_group_measured_fraction_full 0.985
_diffrn_reflns_point_group_measured_fraction_max 0.979
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.370
_diffrn_reflns_theta_min         0.751
_diffrn_source                   'fine-focus sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.089
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6441
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2014/5 (Bruker,2014/5) was used for absorption correction. wR2(int) was 0.0740 before and 0.0628 after correction. The Ratio of minimum to maximum transmission is 0.8639. The \l/2 correction factor is 0.00150.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.215
_exptl_crystal_description       block
_exptl_crystal_F_000             1760
_exptl_crystal_size_max          0.618
_exptl_crystal_size_mid          0.176
_exptl_crystal_size_min          0.166
_refine_diff_density_max         0.185
_refine_diff_density_min         -0.181
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     543
_refine_ls_number_reflns         8969
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0649
_refine_ls_R_factor_gt           0.0442
_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^)+(0.0349P)^2^+0.0256P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0809
_refine_ls_wR_factor_ref         0.0889
_reflns_Friedel_coverage         0.784
_reflns_Friedel_fraction_full    0.968
_reflns_Friedel_fraction_max     0.954
_reflns_number_gt                7128
_reflns_number_total             8969
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8ob01456f2.cif
_cod_data_source_block           20
_cod_depositor_comments
'Adding full bibliography for 7156327--7156329.cif.'
_cod_original_cell_volume        4467.3(3)
_cod_database_code               7156327
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_max   0.985
_shelx_estimated_absorpt_t_min   0.947
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C7(H7), C9(H9), C28(H28), C30(H30)
2.b Secondary CH2 refined with riding coordinates:
 C6(H6A,H6B), C8(H8A,H8B), C10(H10A,H10B), C11(H11A,H11B), C27(H27A,H27B),
 C29(H29A,H29B), C31(H31A,H31B), C32(H32A,H32B)
2.c Aromatic/amide H refined with riding coordinates:
 C13(H13), C14(H14), C15(H15), C34(H34), C35(H35), C36(H36)
2.d Idealised Me refined as rotating group:
 C2(H2A,H2B,H2C), C3(H3A,H3B,H3C), C4(H4A,H4B,H4C), C19(H19A,H19B,H19C),
 C20(H20A,H20B,H20C), C21(H21A,H21B,H21C), C23(H23A,H23B,H23C), C24(H24A,H24B,
 H24C), C25(H25A,H25B,H25C), C40(H40A,H40B,H40C), C41(H41A,H41B,H41C), C42(H42A,
 H42B,H42C)
;
_shelx_res_checksum              86609
_shelx_hkl_checksum              67217
_olex2_submission_special_instructions 'No special instructions were received'