A rearrangement of 3-hydroxyazetidines into 2-oxazolines.
Ruggeri, Michele; Dombrowski, Amanda W.; Djuric, Stevan W.; Baxendale, Ian R.; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.0c00656

data_4038354
_publ_section_title
;
 A rearrangement of 3-hydroxyazetidines into 2-oxazolines.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.0c00656
_journal_year                    2020
_chemical_formula_moiety         'C18 H20 N2 O3 S, 0.5(C4 H8 O2)'
_chemical_formula_sum            'C20 H24 N2 O4 S'
_chemical_formula_weight         388.47
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2017-02-22
_audit_creation_method
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Olex2 1.2-beta
(compiled 2017.01.04 svn.r3372 for OlexSys, GUI svn.r5292)
;
_cell_angle_alpha                90
_cell_angle_beta                 90.544(2)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   15.4987(8)
_cell_length_b                   11.7051(6)
_cell_length_c                   21.9098(11)
_cell_measurement_reflns_used    9829
_cell_measurement_temperature    120
_cell_measurement_theta_max      30.96
_cell_measurement_theta_min      2.38
_cell_volume                     3974.6(4)
_computing_cell_refinement       'SAINT v8.37A (Bruker, 2015)'
_computing_data_collection       'APEX3 v.2016.1-0 (Bruker, 2016)'
_computing_data_reduction        'SAINT v8.37A (Bruker, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL 2014/7 multi-CPU (Sheldrick, 2015)'
_computing_structure_solution    'ShelXS 2013/1 (Sheldrick, 2008)'
_diffrn_ambient_temperature      120
_diffrn_detector_area_resol_mean 10.4
_diffrn_detector_type            'Bruker PHOTON 100 CMOS'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       '3-circle area detector diffractometer'
_diffrn_measurement_device_type  'Bruker D8 Venture'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'focusing mirrors'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0485
_diffrn_reflns_av_unetI/netI     0.0308
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            36410
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        27.499
_diffrn_reflns_theta_max         27.499
_diffrn_reflns_theta_min         2.365
_diffrn_source                   'microfocus sealed X-ray tube'
_diffrn_source_type              'Incoatec I\mS microsource'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.190
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9616
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS-2014/5 (Bruker,2014/5) was used for absorption correction. 
 wR2(int) was 0.1054 before and 0.0602 after correction. The Ratio 
 of minimum to maximum transmission is 0.9616. The \l/2 correction 
 factor is Not present.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.298
_exptl_crystal_description       block
_exptl_crystal_F_000             1648
_exptl_crystal_size_max          0.292
_exptl_crystal_size_mid          0.275
_exptl_crystal_size_min          0.219
_refine_diff_density_max         0.369
_refine_diff_density_min         -0.350
_refine_diff_density_rms         0.051
_refine_ls_extinction_coef       0.00054(18)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     282
_refine_ls_number_reflns         4566
_refine_ls_number_restraints     30
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0590
_refine_ls_R_factor_gt           0.0419
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0460P)^2^+5.1750P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0953
_refine_ls_wR_factor_ref         0.1041
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3652
_reflns_number_total             4566
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            17srv053.cif
_cod_data_source_block           17srv053
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_diffrn_radiation_probe' value 'X-ray' was changed to
'x-ray' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 7556 2019-12-06 15:28:31Z antanas 
;
_cod_database_code               4038354
_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. Rigid body (RIGU) restrains
 O4, C21, C19, O5, C20, C22
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
3. Others
 Uiso(H7A)=Uiso(H7B)=Uiso(H7C)=FVAR(1)
 Uiso(H18A)=Uiso(H18B)=Uiso(H18C)=FVAR(2)
 Fixed Sof: O4(0.5) O5(0.5) C19(0.5) C20(0.5) H20A(0.5) H20B(0.5) H20C(0.5)
 C21(0.5) H21A(0.5) H21B(0.5) C22(0.5) H22A(0.5) H22B(0.5) H22C(0.5)
4.a Rotating group:
 C18(H18A,H18B,H18C), C20(H20A,H20B,H20C), C22(H22A,H22B,H22C)
4.b Secondary CH2 refined with riding coordinates:
 C8(H8A,H8B), C10(H10A,H10B), C21(H21A,H21B)
4.c Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C5(H5), C6(H6), C12(H12), C13(H13), C14(H14), C15(H15),
 C16(H16)
4.d Idealised Me refined as rotating group:
 C7(H7A,H7B,H7C)
;
_oslims_operator_name            'Dr A Batsanov'
_oslims_operator_uuid            642c0cab-15e1-4db6-aabf-d1e3f44b6814
_oslims_submitter_name           'Mr Michele Ruggeri'
_oslims_submitter_uuid           1a56f251-525c-414f-9d37-3e740585b168
_shelx_estimated_absorpt_t_min   0.946
_shelx_estimated_absorpt_t_max   0.959
_shelx_res_checksum              83336
_shelx_shelxl_version_number     2014/7