Protecting-Group-Free Total Synthesis of (-)-Jiadifenolide: Development of a [4 + 1] Annulation toward Multisubstituted Tetrahydrofurans.
Shen, Yang; Li, Linbin; Pan, Zhisheng; Wang, Yinglu; Li, Jundong; Wang, Kuangyu; Wang, Xiance; Zhang, Youyu; Hu, Tianhui; Zhang, Yandong; Organic letters 17 (2015) 5480–5483; doi:10.1021/acs.orglett.5b02845

data_1555415
_publ_section_title
;
 Protecting-Group-Free Total Synthesis of (-)-Jiadifenolide: Development
 of a [4 + 1] Annulation toward Multisubstituted Tetrahydrofurans.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              5480
_journal_page_last               5483
_journal_paper_doi               10.1021/acs.orglett.5b02845
_journal_volume                  17
_journal_year                    2015
_chemical_formula_moiety         'C14 H22 O4'
_chemical_formula_sum            'C14 H22 O4'
_chemical_formula_weight         254.32
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.5953(15)
_cell_length_b                   9.079(2)
_cell_length_c                   21.403(5)
_cell_measurement_reflns_used    4230
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.40
_cell_measurement_theta_min      2.44
_cell_volume                     1281.6(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Xcalibur, Sapphire3, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0209
_diffrn_reflns_av_sigmaI/netI    0.0241
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            6452
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         1.90
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.318
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             552
_exptl_crystal_size_max          1.2
_exptl_crystal_size_mid          0.7
_exptl_crystal_size_min          0.4
_refine_diff_density_max         0.397
_refine_diff_density_min         -0.369
_refine_diff_density_rms         0.055
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.5(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.000
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     163
_refine_ls_number_reflns         2253
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.000
_refine_ls_R_factor_all          0.0512
_refine_ls_R_factor_gt           0.0505
_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^)+(0.1648P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1765
_refine_ls_wR_factor_ref         0.1778
_reflns_number_gt                2208
_reflns_number_total             2253
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol5b02845_si_002.cif
_cod_data_source_block           1
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1555415