Synthetic Approach Toward the Total Synthesis of Kempane Diterpenes via Transannular Diels-Alder Strategy
Franck Caussanel; Keyan Wang; Sreekanth A. Ramachandran; Pierre Deslongchamps; Journal of Organic Chemistry 71 (2006) 7370–7377; doi:10.1021/jo061230k

data_4021956
_publ_section_title
;
 Synthetic Approach Toward the Total Synthesis of Kempane Diterpenes
 via Transannular Diels-Alder Strategy
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7370
_journal_page_last               7377
_journal_paper_doi               10.1021/jo061230k
_journal_volume                  71
_journal_year                    2006
_chemical_formula_sum            'C20 H32 O3'
_chemical_formula_weight         320.46
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                99.427(5)
_cell_angle_beta                 96.076(4)
_cell_angle_gamma                107.618(4)
_cell_formula_units_Z            2
_cell_length_a                   6.6318(16)
_cell_length_b                   10.293(3)
_cell_length_c                   13.750(3)
_cell_measurement_reflns_used    2865
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.98
_cell_measurement_theta_min      2.34
_cell_volume                     870.3(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.915
_diffrn_measured_fraction_theta_max 0.915
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0378
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            5904
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         1.52
_diffrn_source                   'fine-focus sealed tube'
_diffrn_source_type              'Bruker AXS SMART1000/P4'
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.080
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1997a)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.223
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             352
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.461
_refine_diff_density_min         -0.349
_refine_diff_density_rms         0.085
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.993
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     343
_refine_ls_number_reflns         5904
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.993
_refine_ls_R_factor_all          0.0775
_refine_ls_R_factor_gt           0.0693
_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^)+(0.1339P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1707
_refine_ls_wR_factor_ref         0.1743
_reflns_number_gt                4829
_reflns_number_total             5904
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            jo061230ksi20060615_114651.cif
_cod_database_code               4021956