Isothiourea-mediated asymmetric Michael-lactonisation of trifluoromethylenones: a synthetic and mechanistic study
Morrill, Louis C.; Douglas, James; Lebl, Tomas; Slawin, Alexandra M. Z.; Fox, David J.; Smith, Andrew D.; Chemical Science 4 (2013) 4146–; doi:10.1039/c3sc51791h

data_1514746
_publ_section_title
;
 Isothiourea-mediated asymmetric Michael-lactonisation of
 trifluoromethylenones: a synthetic and mechanistic study
;
_journal_issue                   11
_journal_name_full               'Chemical Science'
_journal_page_first              4146
_journal_paper_doi               10.1039/c3sc51791h
_journal_volume                  4
_journal_year                    2013
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C18 H17 F3 O2'
_chemical_formula_sum            'C18 H17 F3 O2'
_chemical_formula_weight         322.33
_space_group_IT_number           5
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      5
_symmetry_space_group_name_Hall  'C 2y'
_symmetry_space_group_name_H-M   'C 1 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.0000
_cell_angle_beta                 90.979(16)
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   19.358(10)
_cell_length_b                   9.419(5)
_cell_length_c                   8.186(4)
_cell_measurement_reflns_used    2688
_cell_measurement_temperature    93
_cell_measurement_theta_max      25.35
_cell_measurement_theta_min      2.40
_cell_volume                     1492.4(13)
_computing_cell_refinement       'CrystalClear-SM Expert 2.0 rc13'
_computing_data_collection
'CrystalClear-SM Expert 2.0 rc13 (Rigaku, 2009)'
_computing_data_reduction        'CrystalClear-SM Expert 2.0 rc13'
_computing_molecular_graphics    'CrystalStructure 4.0'
_computing_publication_material  'CrystalStructure 4.0 (Rigaku, 2010)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR2004 (Burla, et al., 2005)'
_diffrn_ambient_temperature      93
_diffrn_detector_area_resol_mean 14.629
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Rigaku Mercury70'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0700
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            4694
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.33
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.117
_exptl_absorpt_correction_T_max  0.998
_exptl_absorpt_correction_T_min  0.421
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'REQAB (Rigaku, 1998)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.434
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             672.00
_exptl_crystal_size_max          0.120
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.020
_refine_diff_density_max         0.280
_refine_diff_density_min         -0.340
_refine_ls_extinction_coef       0.013(3)
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    mixed
_refine_ls_number_parameters     213
_refine_ls_number_reflns         2405
_refine_ls_number_restraints     2
_refine_ls_R_factor_gt           0.0584
_refine_ls_shift/su_max          0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.1071P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.1899
_reflns_number_gt                1953
_reflns_number_total             2405
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            c3sc51791h.txt
_cod_data_source_block           67
_cod_database_code               1514746