Convenient synthesis of <i>N</i>-alkyl-3,1-benzoxazin-2-ones from carbamate protected anthranil aldehydes and ketones <i>via</i> one-step alkylation/alkoxy rearrangement.
Tian, Guang; Jin, Wei-Li; Qin, Chuanguang; Wang, Jie; Organic & biomolecular chemistry 21 (2023) 5757–5761; doi:10.1039/d3ob00812f

data_7159397
_publ_section_title
;
 Convenient synthesis of <i>N</i>-alkyl-3,1-benzoxazin-2-ones from
 carbamate protected anthranil aldehydes and ketones <i>via</i> one-step
 alkylation/alkoxy rearrangement.
;
_journal_issue                   28
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              5757
_journal_page_last               5761
_journal_paper_doi               10.1039/d3ob00812f
_journal_volume                  21
_journal_year                    2023
_chemical_formula_moiety         'C20 H21 N O3'
_chemical_formula_sum            'C20 H21 N O3'
_chemical_formula_weight         323.38
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2023-02-14
_audit_creation_method
;
Olex2 1.5-alpha
(compiled 2023.01.27 svn.rdd5efbe3 for OlexSys, GUI svn.r6708)
;
_audit_update_record
;
2023-04-26 deposited with the CCDC.	2023-06-28 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   11.1141(4)
_cell_length_b                   14.4848(6)
_cell_length_c                   20.8204(8)
_cell_measurement_reflns_used    6430
_cell_measurement_temperature    100
_cell_measurement_theta_max      26.281
_cell_measurement_theta_min      2.681
_cell_volume                     3351.8(2)
_computing_cell_refinement       'SAINT V8.40A (Bruker, 2019)'
_computing_data_reduction        'SAINT V8.40A (Bruker, 2019)'
_computing_molecular_graphics    'Olex2 1.5-alpha (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5-alpha (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2019/2 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'D8 VENTURE'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0586
_diffrn_reflns_av_unetI/netI     0.0341
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            24220
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.392
_diffrn_reflns_theta_min         2.681
_diffrn_source_current           1.4
_diffrn_source_power             0.07
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6533
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0872 before and 0.0492 after correction.
The Ratio of minimum to maximum transmission is 0.8764.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.282
_exptl_crystal_description       block
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.189
_refine_diff_density_min         -0.223
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         3416
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0631
_refine_ls_R_factor_gt           0.0401
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0416P)^2^+1.4751P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0880
_refine_ls_wR_factor_ref         0.1033
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2583
_reflns_number_total             3416
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3ob00812f2.cif
_cod_data_source_block           mo_2023158_0m
_cod_depositor_comments          'Adding full bibliography for 7159397.cif.'
_cod_database_code               7159397
_shelx_shelxl_version_number     2019/2
_shelx_estimated_absorpt_t_max   0.996
_shelx_estimated_absorpt_t_min   0.987
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C8(H8)
2.b Secondary CH2 refined with riding coordinates:
 C16(H16A,H16B), C7(H7A,H7B)
2.c Aromatic/amide H refined with riding coordinates:
 C13(H13), C17(H17), C10(H10), C12(H12), C11(H11), C1(H1), C5(H5), C4(H4),
 C2(H2), C3(H3)
2.d Idealised Me refined as rotating group:
 C18(H18A,H18B,H18C), C20(H20A,H20B,H20C)
;
_olex2_submission_special_instructions 'No special instructions were received'