Modular Access to Chiral 2,3-Dihydrofurans and 3,4-Dihydro-2 H-pyrans by Stereospecific Activation of Formylcyclopropanes through Combination of Organocatalytic Reductive Coupling and Lewis-Acid-Catalyzed Annulative Ring-Opening Reactions.
Peraka, Swamy; Hussain, Akram; Ramachary, Dhevalapally B.; The Journal of organic chemistry 83 (2018) 9795–9817; doi:10.1021/acs.joc.8b01315

data_4035141
_publ_section_title
;
 Modular Access to Chiral 2,3-Dihydrofurans and 3,4-Dihydro-2 H-pyrans by
 Stereospecific Activation of Formylcyclopropanes through Combination of
 Organocatalytic Reductive Coupling and Lewis-Acid-Catalyzed Annulative
 Ring-Opening Reactions.
;
_journal_issue                   17
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              9795
_journal_page_last               9817
_journal_paper_doi               10.1021/acs.joc.8b01315
_journal_volume                  83
_journal_year                    2018
_chemical_absolute_configuration rm
_chemical_formula_sum            'C24 H30 O6'
_chemical_formula_weight         414.48
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_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.4407(5)
_cell_length_b                   13.4314(4)
_cell_length_c                   16.6407(7)
_cell_measurement_reflns_used    1731
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      67.9790
_cell_measurement_theta_min      3.3010
_cell_volume                     2333.58(16)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.976
_diffrn_measurement_device_type  'Xcalibur, Eos, Gemini'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0249
_diffrn_reflns_av_unetI/netI     0.0439
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.976
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            5591
_diffrn_reflns_point_group_measured_fraction_full 0.862
_diffrn_reflns_point_group_measured_fraction_max 0.830
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         71.948
_diffrn_reflns_theta_min         4.230
_exptl_absorpt_coefficient_mu    0.686
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.40916
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.46 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.180
_exptl_crystal_description       block
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.179
_refine_diff_density_min         -0.147
_refine_diff_density_rms         0.031
_refine_ls_abs_structure_details
;
 Flack x determined using 904 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.0(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     276
_refine_ls_number_reflns         3806
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0594
_refine_ls_R_factor_gt           0.0461
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0462P)^2^+0.1632P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1071
_refine_ls_wR_factor_ref         0.1182
_reflns_Friedel_coverage         0.500
_reflns_Friedel_fraction_full    0.683
_reflns_Friedel_fraction_max     0.640
_reflns_number_gt                3090
_reflns_number_total             3806
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b01315_si_005.cif
_cod_data_source_block           dbr0003a
_cod_database_code               4035141
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              8241
_shelx_hkl_checksum              61853