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_4132354
_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         'C18 H20 O3'
_chemical_formula_sum            'C18 H20 O3'
_chemical_formula_weight         284.34
_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   geom
_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                 99.019(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.5021(5)
_cell_length_b                   18.2651(11)
_cell_length_c                   10.4008(6)
_cell_measurement_reflns_used    9873
_cell_measurement_temperature    153
_cell_measurement_theta_max      68.233
_cell_measurement_theta_min      2.419
_cell_volume                     1407.57(15)
_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      153.0
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.993
_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  0.0431
_diffrn_reflns_av_unetI/netI     0.0271
_diffrn_reflns_Laue_measured_fraction_full 0.995
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            16045
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.227
_diffrn_reflns_theta_min         4.842
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.723
_exptl_absorpt_correction_T_max  0.7531
_exptl_absorpt_correction_T_min  0.6772
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1180 before and 0.0732 after correction. The Ratio of minimum to maximum transmission is 0.8992. 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    1.342
_exptl_crystal_description       block
_exptl_crystal_F_000             608
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.225
_refine_diff_density_min         -0.202
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.075
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     193
_refine_ls_number_reflns         2557
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.075
_refine_ls_R_factor_all          0.0452
_refine_ls_R_factor_gt           0.0421
_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^)+(0.0557P)^2^+0.6282P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1117
_refine_ls_wR_factor_ref         0.1139
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2362
_reflns_number_total             2557
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b03015_si_002.cif
_cod_data_source_block           s
_cod_database_code               4132354
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.812
_shelx_estimated_absorpt_t_min   0.714
_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:
 C007(H007), C00B(H00B), C00D(H00D), C00E(H00E)
2.b Secondary CH2 refined with riding coordinates:
 C00G(H00A,H00C), C00H(H00F,H00G), C00I(H00H,H00I), C00J(H00J,H00K)
2.c Aromatic/amide H refined with riding coordinates:
 C006(H006)
2.d Idealised Me refined as rotating group:
 C00K(H00L,H00M,H00N), C00L(H00O,H00P,H00Q)
2.e Idealised tetrahedral OH refined as rotating group:
 O002(H002)
;
_shelx_res_checksum              12922
_shelx_hkl_checksum              35291
_olex2_submission_special_instructions 'No special instructions were received'