MgI2-Mediated Ring Expansions of Secondary Methylenecyclopropyl Amides
Mark Lautens; Wooseok Han; Jack Hung-Chang Liu; Journal of the American Chemical Society 125 (2003) 4028–4029; doi:10.1021/ja028967l

data_4113627
_publ_section_title
;
 MgI2-Mediated Ring Expansions of Secondary Methylenecyclopropyl Amides
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              4028
_journal_page_last               4029
_journal_paper_doi               10.1021/ja028967l
_journal_volume                  125
_journal_year                    2003
_chemical_formula_moiety         'C24 H23 N3 O3 S'
_chemical_formula_sum            'C24 H23 N3 O3 S'
_chemical_formula_weight         433.51
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 100.117(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.0245(4)
_cell_length_b                   7.5900(2)
_cell_length_c                   19.2583(5)
_cell_measurement_reflns_used    3816
_cell_measurement_temperature    150(1)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      2.6
_cell_volume                     2161.99(10)
_computing_cell_refinement       'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2001)'
_computing_data_reduction        'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'SHELXTL V6.12 (Sheldrick, 2001)'
_computing_publication_material  'SHELXTL V6.12 (Sheldrick, 2001)'
_computing_structure_refinement  'SHELXTL V6.12 (Sheldrick, 2001)'
_computing_structure_solution    'SHELXTL V6.12 (Sheldrick, 2001)'
_diffrn_ambient_temperature      150(1)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '\f scans and \w scans with \k offsets'
_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  0.034
_diffrn_reflns_av_sigmaI/netI    0.050
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            12508
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.75
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.181
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.332
_exptl_crystal_description       block
_exptl_crystal_F_000             912
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.316
_refine_diff_density_min         -0.384
_refine_diff_density_rms         0.042
_refine_ls_extinction_coef       0.0078(15)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.071
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     286
_refine_ls_number_reflns         3801
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0451
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0302P)^2^+0.8307P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0887
_refine_ls_wR_factor_ref         0.0947
_reflns_number_gt                3268
_reflns_number_total             3801
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ja028967lsi20021017_040605_2.cif
_cod_data_source_block           k01223
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4113627