Asymmetric Total Synthesis of (-)-Arborisidine and (-)-19-epi-Arborisidine Enabled by a Catalytic Enantioselective Pictet-Spengler Reaction.
Andres, Rémi; Wang, Qian; Zhu, Jieping; Journal of the American Chemical Society  (2020) –; doi:10.1021/jacs.0c05804

data_4135128
_publ_section_title
;
 Asymmetric Total Synthesis of (-)-Arborisidine and
 (-)-19-epi-Arborisidine Enabled by a Catalytic Enantioselective
 Pictet-Spengler Reaction.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.0c05804
_journal_year                    2020
_chemical_formula_moiety         'C25 H32 N2 O5'
_chemical_formula_sum            'C25 H32 N2 O5'
_chemical_formula_weight         440.52
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_date             2020-03-24
_audit_creation_method
;
Olex2 1.3
(compiled 2020.02.04 svn.rd84adfe8 for OlexSys, GUI svn.r6032)
;
_cell_angle_alpha                90
_cell_angle_beta                 108.018(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.4748(5)
_cell_length_b                   10.1278(3)
_cell_length_c                   16.7654(6)
_cell_measurement_reflns_used    6668
_cell_measurement_temperature    100.00(10)
_cell_measurement_theta_max      29.1930
_cell_measurement_theta_min      3.2190
_cell_volume                     2337.24(15)
_computing_cell_refinement       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_collection       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_reduction        'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_molecular_graphics    'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.3 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      100.00(10)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 5.2817
_diffrn_detector_type            AtlasS2
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.881
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
--------------------------------------------------------------------------
  1  \w    -56.00  40.00   1.00   22.21    --   11.66 -57.00  90.00   96
  2  \w    -17.00  76.00   1.00   22.21    --   11.66  77.00   0.00   93
  3  \w    -11.00  85.00   1.00   22.21    --   11.66  57.00-120.00   96
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at home/near, AtlasS2'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      0.0006232000
_diffrn_orient_matrix_UB_12      0.0593549000
_diffrn_orient_matrix_UB_13      0.0225936000
_diffrn_orient_matrix_UB_21      0.0361148000
_diffrn_orient_matrix_UB_22      -0.0269909000
_diffrn_orient_matrix_UB_23      0.0350431000
_diffrn_orient_matrix_UB_31      0.0367469000
_diffrn_orient_matrix_UB_32      0.0255394000
_diffrn_orient_matrix_UB_33      -0.0155332000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0336
_diffrn_reflns_av_unetI/netI     0.0527
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.881
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            17125
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.881
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         29.658
_diffrn_reflns_theta_min         2.588
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.423
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.46 (Rigaku Oxford Diffraction, 2018)
Numerical absorption correction based on gaussian integration over
a multifaceted crystal model.
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear pale colourless'
_exptl_crystal_density_diffrn    1.252
_exptl_crystal_description       plate
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.649
_exptl_crystal_size_mid          0.412
_exptl_crystal_size_min          0.238
_refine_diff_density_max         0.348
_refine_diff_density_min         -0.233
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.966
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     297
_refine_ls_number_reflns         5817
_refine_ls_number_restraints     285
_refine_ls_restrained_S_all      0.943
_refine_ls_R_factor_all          0.0671
_refine_ls_R_factor_gt           0.0414
_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^)+(0.0573P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0974
_refine_ls_wR_factor_ref         0.1023
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3966
_reflns_number_total             5817
_reflns_threshold_expression     'I > 2\s(I)'
_twin_special_details
;
Component 2 rotated by -176.2060\% 
 around [-0.05 1.00 -0.05] (reciprocal) or [-0.03 1.00 -0.03] (direct)
;
_cod_data_source_file            ja0c05804_si_008.cif
_cod_data_source_block           randres-2rat11p2
_cod_original_cell_volume        2337.24(14)
_cod_database_code               4135128
_shelx_shelxl_version_number     2018/3
_chemical_oxdiff_formula         'C25 H32 N2 O5'
_shelx_estimated_absorpt_t_max   0.980
_shelx_estimated_absorpt_t_min   0.946
_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. Rigid body (RIGU) restrains
 All non-hydrogen atoms
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
3.a Secondary CH2 refined with riding coordinates:
 C10(H10A,H10B), C11(H11A,H11B)
3.b Aromatic/amide H refined with riding coordinates:
 C4(H4), C5(H5), C6(H6), C7(H7)
3.c Idealised Me refined as rotating group:
 C12(H12A,H12B,H12C), C17(H17A,H17B,H17C), C18(H18A,H18B,H18C), C19(H19A,H19B,
 H19C), C20(H20A,H20B,H20C), C23(H23A,H23B,H23C), C24(H24A,H24B,H24C), C25(H25A,
 H25B,H25C)
;
_shelx_res_checksum              93364
_shelx_hkl_checksum              36444
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 1.711
_oxdiff_exptl_absorpt_empirical_full_min 0.601
_oxdiff_twin_integration_method  simultaneous
_oxdiff_twin_items               2