Synthesis of 2-N/S/C-substituted benzothiazoles via intramolecular cyclative cleavage of benzotriazole ring.
Kumar, Dhananjay; Mishra, Bhuwan B.; Tiwari, Vinod K.; The Journal of organic chemistry 79 (2014) 251–266; doi:10.1021/jo4024107

data_4029069
_publ_section_title
;
 Synthesis of 2-N/S/C-substituted benzothiazoles via intramolecular
 cyclative cleavage of benzotriazole ring.
;
_journal_issue                   1
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              251
_journal_page_last               266
_journal_paper_doi               10.1021/jo4024107
_journal_volume                  79
_journal_year                    2014
_chemical_formula_moiety         'C16 H16 N4 S'
_chemical_formula_sum            'C16 H16 N4 S'
_chemical_formula_weight         296.3892
_chemical_melting_point          192
_chemical_name_systematic
2-(4-(Pyridin-2-yl)piperazin-1-yl)benzo[d]thiazole
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.8893(3)
_cell_length_b                   8.5161(5)
_cell_length_c                   28.350(2)
_cell_measurement_reflns_used    1098
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.8989
_cell_measurement_theta_min      3.4524
_cell_volume                     1421.86(15)
_computing_cell_refinement       'CrysAlis Pro, Agilent Technologies'
_computing_data_collection       'CrysAlis Pro, Agilent Technologies'
_computing_data_reduction        'CrysAlis Pro, Agilent Technologies'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.0938
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.889
_diffrn_measurement_device_type  'Xcalibur, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0189
_diffrn_reflns_av_sigmaI/netI    0.0502
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -36
_diffrn_reflns_number            4430
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.96
_diffrn_reflns_theta_min         3.53
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.226
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.88237
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrysAlisPro, Agilent Technologies Lts.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.445
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             648
_exptl_crystal_recrystallization_method 'ethyl acetate, hexane, rt, 1 atm'
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.237
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.04(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     254
_refine_ls_number_reflns         2936
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0650
_refine_ls_R_factor_gt           0.0455
_refine_ls_shift/su_max          0.013
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0346P)^2^+0.0287P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0811
_refine_ls_wR_factor_ref         0.0904
_reflns_number_gt                2315
_reflns_number_total             2936
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo4024107_si_002.cif
_cod_data_source_block           compound_4e
_cod_original_cell_volume        1421.88(16)
_cod_database_code               4029069