Highly efficient synthesis of 3-amino-/alkylthio-cyclobut-2-en-1-ones based on the cyclization of acyl ketene dithioacetals.
Zhao, Yu-Long; Yang, Shao-Chun; Di, Chong-Hui; Han, Xiao-Dan; Liu, Qun; Chemical communications (Cambridge, England) 46 (2010) 7614–7616; doi:10.1039/c0cc02470h

data_7113054
_publ_section_title
;
 Highly efficient synthesis of 3-amino-/alkylthio-cyclobut-2-en-1-ones
 based on the cyclization of acyl ketene dithioacetals.
;
_journal_issue                   40
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              7614
_journal_page_last               7616
_journal_paper_doi               10.1039/c0cc02470h
_journal_volume                  46
_journal_year                    2010
_chemical_formula_sum            'C15 H17 N O2'
_chemical_formula_weight         243.30
_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                 93.474(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.9255(7)
_cell_length_b                   19.517(3)
_cell_length_c                   13.661(2)
_cell_measurement_reflns_used    2296
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.01
_cell_measurement_theta_min      1.25
_cell_volume                     1310.8(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0441
_diffrn_reflns_av_sigmaI/netI    0.0529
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -3
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6523
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         1.82
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.986
_exptl_absorpt_correction_T_min  0.981
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.233
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.17
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.182
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.007
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     170
_refine_ls_number_reflns         2296
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.007
_refine_ls_R_factor_all          0.1098
_refine_ls_R_factor_gt           0.0515
_refine_ls_shift/su_max          0.018
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0764P)^2^+0.1270P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1292
_refine_ls_wR_factor_ref         0.1558
_reflns_number_gt                1266
_reflns_number_total             2296
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0cc02470h.txt
_cod_data_source_block           1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        1310.9(3)
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7113054