Direct, efficient, solvent-free synthesis of 2-aryl-1,2,3,4-tetrahydroquinazolines
Correa, Waldo H.; Papadopoulos, Stavroula; Radnidge, Peta; Roberts, Brett A.; Scott, Janet L.; Green Chemistry 4 (2002) 245–; doi:10.1039/b202729c

data_7204412
_publ_section_title
;
 Direct, efficient, solvent-free synthesis of
 2-aryl-1,2,3,4-tetrahydroquinazolines
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_journal_issue                   3
_journal_name_full               'Green Chemistry'
_journal_page_first              245
_journal_paper_doi               10.1039/b202729c
_journal_volume                  4
_journal_year                    2002
_chemical_formula_moiety         'C16 H18 N2 O2'
_chemical_formula_sum            'C16 H18 N2 O2'
_chemical_formula_weight         270.32
_chemical_melting_point          367(5)
_chemical_name_common            2-(veratryl)-1,2,3,4-tetrahydroquinazoline
_chemical_name_systematic
; 
2-(3',4'-dimethoxyphenyl)-1,2,3,4-tetrahydroquinazoline 
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 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            16
_cell_length_a                   20.4722(3)
_cell_length_b                   13.2281(2)
_cell_length_c                   20.7521(4)
_cell_measurement_temperature    123(2)
_cell_volume                     5619.84(16)
_computing_cell_refinement       'Nonius Collect'
_computing_data_collection       'Nonius Collect'
_computing_data_reduction        'Nonius Collect'
_computing_molecular_graphics    Xseed
_computing_publication_material  Ciftab
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.984
_diffrn_measured_fraction_theta_max 0.984
_diffrn_measurement_device_type  'Enraf Nonius Kappa CCd'
_diffrn_measurement_method       'phi + w 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  0.0731
_diffrn_reflns_av_sigmaI/netI    0.1351
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            30579
_diffrn_reflns_theta_full        28.29
_diffrn_reflns_theta_max         28.29
_diffrn_reflns_theta_min         1.99
_exptl_absorpt_coefficient_mu    0.085
_exptl_crystal_colour            needles
_exptl_crystal_density_diffrn    1.278
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       colourless
_exptl_crystal_F_000             2304
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.251
_refine_diff_density_min         -0.310
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.5(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     761
_refine_ls_number_reflns         13156
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.1532
_refine_ls_R_factor_gt           0.0639
_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^)+(0.0415P)^2^+0.7967P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0959
_refine_ls_wR_factor_ref         0.1197
_reflns_number_gt                7466
_reflns_number_total             13156
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b202729c.txt
_cod_data_source_block           4j
_cod_depositor_comments
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The following automatic conversions were performed:

'_chemical_melting_point' value '89.1-98.7Deg. C' was changed to
'367(5)' - it was converted from degrees Celsius(C) to Kelvins(K),
the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1569 2011-02-09 13:29:24Z adriana 
;
_cod_original_sg_symbol_H-M      Pna21
_cod_database_code               7204412