A divergent [5+2] cascade approach to bicyclo[3.2.1]octanes: facile synthesis of ent-kaurene and cedrene-type skeletons
He, Chi; Bai, Zengbing; Hu, Jialei; Wang, Bingnan; Xie, Hujun; Yu, Lei; Ding, Hanfeng; Chem. Commun.  (2017) –; doi:10.1039/C7CC04292B

data_7120390
_publ_section_title
;
 A divergent [5+2] cascade approach to bicyclo[3.2.1]octanes: facile
 synthesis of ent-kaurene and cedrene-type skeletons
;
_journal_name_full               'Chem. Commun.'
_journal_paper_doi               10.1039/C7CC04292B
_journal_year                    2017
_chemical_formula_moiety         'C20 H26 O2'
_chemical_formula_sum            'C20 H26 O2'
_chemical_formula_weight         298.41
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2016-03-14
_audit_creation_method
;
Olex2 1.2
(compiled 2014.03.20 svn.r2914 for OlexSys, GUI svn.r4816)
;
_audit_update_record
;
2017-04-13 deposited with the CCDC.
2017-07-05 downloaded from the CCDC.
;
_cell_angle_alpha                95.985(6)
_cell_angle_beta                 95.246(6)
_cell_angle_gamma                101.426(7)
_cell_formula_units_Z            2
_cell_length_a                   6.1485(5)
_cell_length_b                   8.5900(7)
_cell_length_c                   16.0047(11)
_cell_measurement_reflns_used    1417
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.3692
_cell_measurement_theta_min      3.3962
_cell_volume                     818.56(11)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
;
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      293.15
_diffrn_detector_area_resol_mean 10.3592
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_UB_11      -0.0775797000
_diffrn_orient_matrix_UB_12      0.0438531000
_diffrn_orient_matrix_UB_13      -0.0158910000
_diffrn_orient_matrix_UB_21      0.0853245000
_diffrn_orient_matrix_UB_22      0.0468941000
_diffrn_orient_matrix_UB_23      -0.0191704000
_diffrn_orient_matrix_UB_31      -0.0271744000
_diffrn_orient_matrix_UB_32      -0.0555691000
_diffrn_orient_matrix_UB_33      -0.0373130000
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0233
_diffrn_reflns_av_unetI/netI     0.0474
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5115
_diffrn_reflns_theta_full        25.34
_diffrn_reflns_theta_max         25.34
_diffrn_reflns_theta_min         3.40
_diffrn_source                   'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.97224
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.35.11 (release 16-05-2011 CrysAlis171 .NET)
(compiled May 16 2011,17:55:39)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.211
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             324
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.36
_refine_diff_density_max         0.172
_refine_diff_density_min         -0.173
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     203
_refine_ls_number_reflns         3000
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0782
_refine_ls_R_factor_gt           0.0504
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0464P)^2^+0.1935P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1093
_refine_ls_wR_factor_ref         0.1298
_reflns_number_gt                2132
_reflns_number_total             3000
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c7cc04292b2.cif
_cod_data_source_block           160311_wbn_10162
_cod_original_cell_volume        818.57(11)
_cod_database_code               7120390
_chemical_oxdiff_formula         'c10 h10 o10'
_reflns_odcompleteness_completeness 99.58
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     26.32
_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:
 C3(H3), C6(H6), C11(H11)
2.b Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B), C9(H9A,H9B), C10(H10A,H10B), C15(H15A,H15B)
2.c Aromatic/amide H refined with riding coordinates:
 C8(H8), C13(H13), C14(H14)
2.d Idealised Me refined as rotating group:
 C17(H17A,H17B,H17C), C18(H18A,H18B,H18C), C19(H19A,H19B,H19C), C20(H20A,H20B,
 H20C)
;