A Unifying Synthesis Approach to the C<sub>18</sub>-, C<sub>19</sub>-, and C<sub>20</sub>-Diterpenoid Alkaloids.
Kou, Kevin G. M.; Kulyk, Svitlana; Marth, Christopher J.; Lee, Jack C.; Doering, Nicolle A.; Li, Beryl X.; Gallego, Gary M.; Lebold, Terry P.; Sarpong, Richmond; Journal of the American Chemical Society 139 (2017) 13882–13896; doi:10.1021/jacs.7b07706

data_4131634
_publ_section_title
;
 A Unifying Synthesis Approach to the C<sub>18</sub>-, C<sub>19</sub>-,
 and C<sub>20</sub>-Diterpenoid Alkaloids.
;
_journal_issue                   39
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              13882
_journal_page_last               13896
_journal_paper_doi               10.1021/jacs.7b07706
_journal_volume                  139
_journal_year                    2017
_chemical_formula_sum            'C24 H33 N O5'
_chemical_formula_weight         415.51
_chemical_name_common            KK2-194-2
_chemical_name_systematic        sarpong126
_space_group.centring_type       primitive
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                96.521(2)
_cell_angle_beta                 102.919(2)
_cell_angle_gamma                104.785(2)
_cell_formula_units_Z            2
_cell_length_a                   8.3725(4)
_cell_length_b                   9.6019(4)
_cell_length_c                   13.9337(6)
_cell_measurement_reflns_used    9756
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      68.41
_cell_measurement_theta_min      4.84
_cell_volume                     1038.21(8)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    ORTEP-32
_computing_publication_material  WinGX
_computing_structure_refinement  SHELXL-2014
_computing_structure_solution    SHELXT-2014
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.973
_diffrn_measured_fraction_theta_max 0.963
_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  0.0338
_diffrn_reflns_av_unetI/netI     0.0227
_diffrn_reflns_Laue_measured_fraction_full 0.973
_diffrn_reflns_Laue_measured_fraction_max 0.963
_diffrn_refln_scan_rate          1
_diffrn_refln_scan_width         2.0
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            21714
_diffrn_reflns_point_group_measured_fraction_full 0.973
_diffrn_reflns_point_group_measured_fraction_max 0.963
_diffrn_reflns_theta_full        67.000
_diffrn_reflns_theta_max         68.498
_diffrn_reflns_theta_min         3.309
_diffrn_source                   'microfocus rotating anode'
_exptl_absorpt_coefficient_mu    0.746
_exptl_absorpt_correction_T_max  0.929
_exptl_absorpt_correction_T_min  0.802
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.329
_exptl_crystal_description       prism
_exptl_crystal_F_000             448
_exptl_crystal_size_max          0.050
_exptl_crystal_size_mid          0.040
_exptl_crystal_size_min          0.030
_refine_diff_density_max         0.288
_refine_diff_density_min         -0.209
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     276
_refine_ls_number_reflns         3693
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0401
_refine_ls_R_factor_gt           0.0347
_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^)+(0.0410P)^2^+0.4902P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0856
_refine_ls_wR_factor_ref         0.0895
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3241
_reflns_number_total             3693
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b07706_si_007.cif
_cod_data_source_block           sarpong126
_cod_database_code               4131634
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.964
_shelx_estimated_absorpt_t_max   0.978
_shelx_res_checksum              45538
_shelx_hkl_checksum              57836