Intramolecular Photocycloaddition of 2(5 H)-Furanones to Temporarily Tethered Terminal Alkenes as a Stereoselective Source of Enantiomerically Pure Polyfunctionalyzed Cyclobutanes.
Xin, Yangchun; Rodríguez-Santiago, Luís; Sodupe, Mariona; Álvarez-Larena, Angel; Busqué, Félix; Alibés, Ramon; The Journal of organic chemistry 83 (2018) 3188–3199; doi:10.1021/acs.joc.8b00088

data_4033529
_publ_section_title
;
 Intramolecular Photocycloaddition of 2(5 H)-Furanones to Temporarily
 Tethered Terminal Alkenes as a Stereoselective Source of Enantiomerically
 Pure Polyfunctionalyzed Cyclobutanes.
;
_journal_issue                   6
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              3188
_journal_page_last               3199
_journal_paper_doi               10.1021/acs.joc.8b00088
_journal_volume                  83
_journal_year                    2018
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C10 H12 O4'
_chemical_formula_sum            'C10 H12 O4'
_chemical_formula_weight         196.20
_chemical_name_systematic
;
(3S,3aR,4R,9aS)-hexahydro-2H-3,4-methanofuro[2,3-c]oxocine-2,1(3H)-dione
;
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
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_atom_sites_solution_secondary   direct
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_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.0477(3)
_cell_length_b                   7.5960(4)
_cell_length_c                   20.0487(11)
_cell_measurement_reflns_used    4959
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      28.29
_cell_measurement_theta_min      2.87
_cell_volume                     921.00(8)
_computing_cell_refinement       'SAINT 5.0 (Bruker)'
_computing_data_collection       'SMART 5.6 (Bruker)'
_computing_data_reduction        'SAINT 5.0 (Bruker)'
_computing_molecular_graphics    'SHELXTL-NT 6.1 (Bruker)'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_structure_solution    'SHELXTL-NT 6.1 (Bruker)'
_diffrn_ambient_temperature      296(2)
_diffrn_detector_area_resol_mean 8.13
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.940
_diffrn_measurement_device_type  'Bruker SMART-APEX diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0169
_diffrn_reflns_av_unetI/netI     0.0165
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.940
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            7363
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.920
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         28.785
_diffrn_reflns_theta_min         2.032
_diffrn_source                   'sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.110
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.904
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, 2.05'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.415
_exptl_crystal_description       prism
_exptl_crystal_F_000             416
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.300
_exptl_crystal_size_min          0.300
_refine_diff_density_max         0.159
_refine_diff_density_min         -0.233
_refine_diff_density_rms         0.059
_refine_ls_abs_structure_details
;
 Flack x determined using 792 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.1(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.073
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         2203
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.073
_refine_ls_R_factor_all          0.0395
_refine_ls_R_factor_gt           0.0382
_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^)+(0.0641P)^2^+0.0629P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0998
_refine_ls_wR_factor_ref         0.1011
_reflns_Friedel_coverage         0.653
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.890
_reflns_number_gt                2116
_reflns_number_total             2203
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b00088_si_002.cif
_cod_data_source_block           compound19
_cod_depositor_comments          'Adding full bibliography for 4033529.cif.'
_cod_database_code               4033529
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_min   0.957
_shelx_estimated_absorpt_t_max   0.968
_shelx_res_checksum              33191
_shelx_hkl_checksum              11097