Toward a General Route to the Eunicellin Diterpenes: The Asymmetric Total Synthesis of Deacetoxyalcyonin Acetate
Gary A. Molander; David J. St. Jean; Julia Haas; Journal of the American Chemical Society 126 (2004) 1642–1643; doi:10.1021/ja0398464

data_4112237
_publ_section_title
;
 Toward a General Route to the Eunicellin Diterpenes: The Asymmetric Total
 Synthesis of Deacetoxyalcyonin Acetate
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1642
_journal_page_last               1643
_journal_paper_doi               10.1021/ja0398464
_journal_volume                  126
_journal_year                    2004
_chemical_formula_sum            'C20 H28 O5'
_chemical_formula_weight         348.42
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.3569(13)
_cell_length_b                   11.7844(15)
_cell_length_c                   14.8684(19)
_cell_measurement_temperature    143(1)
_cell_volume                     1814.7(4)
_computing_data_collection       'CrystalClear (Rigaku, 1999)'
_computing_data_reduction        'CrystalClear (Rigaku, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare, 1999)'
_diffrn_ambient_temperature      143(1)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       'CCD Area Detector'
_diffrn_measurement_device_type  'Rigaku Mercury'
_diffrn_measurement_method       'phi and omega rotations'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0168
_diffrn_reflns_av_sigmaI/netI    0.0213
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            8994
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         2.62
_exptl_absorpt_coefficient_mu    0.090
_exptl_crystal_density_diffrn    1.275
_exptl_crystal_F_000             752
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.148
_refine_diff_density_min         -0.164
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         3291
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0377
_refine_ls_R_factor_gt           0.0343
_refine_ls_shift/su_max          0.020
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0493P)^2^+0.2879P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0835
_refine_ls_wR_factor_ref         0.0858
_reflns_number_gt                3098
_reflns_number_total             3291
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja0398464si20031203_080212_4.cif
_cod_data_source_block           cmpd16
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_database_code               4112237