Stereoselective Synthesis of Isochromanones by an Asymmetric Ortho-Lithiation Strategy: Synthetic Access to the Isochromanone Core of the Ajudazols.
Essig, Sebastian; Menche, Dirk; The Journal of organic chemistry 81 (2016) 1943–1966; doi:10.1021/acs.joc.5b02781

data_4036563
_publ_section_title
;
 Stereoselective Synthesis of Isochromanones by an Asymmetric
 Ortho-Lithiation Strategy: Synthetic Access to the Isochromanone Core of
 the Ajudazols.
;
_journal_issue                   5
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              1943
_journal_page_last               1966
_journal_paper_doi               10.1021/acs.joc.5b02781
_journal_volume                  81
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_sum            'C26 H44 O4 Si2'
_chemical_formula_weight         476.79
_chemical_name_common            '72 in manuscript'
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 91.392(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.6819(6)
_cell_length_b                   27.0915(11)
_cell_length_c                   15.1614(7)
_cell_measurement_reflns_used    9172
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      21.94
_cell_measurement_theta_min      2.43
_cell_volume                     6028.7(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'ImuS microsource'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0293
_diffrn_reflns_av_sigmaI/netI    0.0426
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       30
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            53802
_diffrn_reflns_theta_full        23.26
_diffrn_reflns_theta_max         23.26
_diffrn_reflns_theta_min         1.34
_exptl_absorpt_coefficient_mu    0.143
_exptl_absorpt_correction_T_max  0.9831
_exptl_absorpt_correction_T_min  0.9625
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Sheldrick, G. M. (2008). <i>SADABS</i>. University of G\"ottingen, Germany.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.051
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       polyhedron
_exptl_crystal_F_000             2080
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.482
_refine_diff_density_min         -0.328
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.011
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1387
_refine_ls_number_reflns         17224
_refine_ls_number_restraints     3394
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0874
_refine_ls_R_factor_gt           0.0584
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0784P)^2^+2.9006P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1432
_refine_ls_wR_factor_ref         0.1606
_reflns_number_gt                12618
_reflns_number_total             17224
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo5b02781_si_002.cif
_cod_data_source_block           se5
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               4036563