Total Synthesis of (±)-Cephanolides B and C via a Palladium-Catalyzed Cascade Cyclization and Late-Stage sp<sup>3</sup> C-H Bond Oxidation.
Xu, Lun; Wang, Chao; Gao, Ziwei; Zhao, Yu-Ming; Journal of the American Chemical Society 140 (2018) 5653–5658; doi:10.1021/jacs.8b03015

data_4132352
_publ_section_title
;
 Total Synthesis of (+-)-Cephanolides B and C via a Palladium-Catalyzed
 Cascade Cyclization and Late-Stage sp<sup>3</sup> C-H Bond Oxidation.
;
_journal_issue                   16
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5653
_journal_page_last               5658
_journal_paper_doi               10.1021/jacs.8b03015
_journal_volume                  140
_journal_year                    2018
_chemical_formula_moiety         'C19 H22 O4'
_chemical_formula_sum            'C19 H22 O4'
_chemical_formula_weight         314.36
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2018-01-07
_audit_creation_method
;
Olex2 1.2
(compiled 2017.08.10 svn.r3458 for OlexSys, GUI svn.r5381)
;
_cell_angle_alpha                90
_cell_angle_beta                 91.584(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.4065(10)
_cell_length_b                   14.5426(16)
_cell_length_c                   11.1202(12)
_cell_measurement_reflns_used    9982
_cell_measurement_temperature    162
_cell_measurement_theta_max      68.284
_cell_measurement_theta_min      3.038
_cell_volume                     1520.6(3)
_computing_cell_refinement       'SAINT V8.38A (?, 2016)'
_computing_data_reduction        'SAINT V8.38A (?, 2016)'
_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    'XT (Sheldrick, 2015)'
_diffrn_ambient_temperature      162.9
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.987
_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  0.0343
_diffrn_reflns_av_unetI/netI     0.0220
_diffrn_reflns_Laue_measured_fraction_full 0.990
_diffrn_reflns_Laue_measured_fraction_max 0.987
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            16901
_diffrn_reflns_point_group_measured_fraction_full 0.990
_diffrn_reflns_point_group_measured_fraction_max 0.987
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.303
_diffrn_reflns_theta_min         5.008
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.773
_exptl_absorpt_correction_T_max  0.7531
_exptl_absorpt_correction_T_min  0.6935
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.0945 before and 0.0613 after correction. The Ratio of minimum to maximum transmission is 0.9209. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.373
_exptl_crystal_description       block
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.270
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     220
_refine_ls_number_reflns         2754
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0375
_refine_ls_R_factor_gt           0.0369
_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^)+(0.0369P)^2^+0.8266P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0905
_refine_ls_wR_factor_ref         0.0910
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2683
_reflns_number_total             2754
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b03015_si_005.cif
_cod_data_source_block           s
_cod_database_code               4132352
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.801
_shelx_estimated_absorpt_t_min   0.699
_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, All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C00E(H00E), C00J(H00K), C00K(H00L)
2.b Secondary CH2 refined with riding coordinates:
 C00D(H00A,H00B), C00I(H00I,H00J), C00N(H00S,H00T)
2.c Aromatic/amide H refined with riding coordinates:
 C008(H008)
2.d Idealised Me refined as rotating group:
 C00G(H00C,H00D,H00F), C00L(H00M,H00N,H00O), C00M(H00P,H00Q,H00R)
2.e Idealised tetrahedral OH refined as rotating group:
 O002(H002)
;
_shelx_res_checksum              11271
_shelx_hkl_checksum              34056
_olex2_submission_special_instructions 'No special instructions were received'