Divergent Synthesis of Methylene Lactone- and Methylene Lactam-Based Spiro Compounds: Utility of Amido-Functionalized γ-Hydroxylactam as a Precursor for Cytotoxic <i>N</i>,<i>O</i>- and <i>N</i>,<i>N</i>-Spiro Compounds.
Sengoku, Tetsuya; Shirai, Anna; Takano, Ayaka; Inuzuka, Toshiyasu; Sakamoto, Masami; Takahashi, Masaki; Yoda, Hidemi; The Journal of organic chemistry 84 (2019) 12532–12541; doi:10.1021/acs.joc.9b02038

data_4033955
_publ_section_title
;
 Divergent Synthesis of Methylene Lactone- and Methylene Lactam-Based
 Spiro Compounds: Utility of Amido-Functionalized \g-Hydroxylactam as a
 Precursor for Cytotoxic <i>N</i>,<i>O</i>- and <i>N</i>,<i>N</i>-Spiro
 Compounds.
;
_journal_issue                   19
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              12532
_journal_page_last               12541
_journal_paper_doi               10.1021/acs.joc.9b02038
_journal_volume                  84
_journal_year                    2019
_chemical_formula_sum            'C15 H20 B N O3'
_chemical_formula_weight         273.13
_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     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   10.5088(12)
_cell_length_b                   10.1424(12)
_cell_length_c                   27.846(3)
_cell_measurement_reflns_used    5062
_cell_measurement_temperature    173
_cell_measurement_theta_max      23.5380
_cell_measurement_theta_min      2.4282
_cell_volume                     2968.0(6)
_computing_cell_refinement       'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_data_collection       'APEX2 (Bruker AXS, 2006)'
_computing_data_reduction        'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_molecular_graphics    'XSHEL (Bruker AXS,2002)'
_computing_publication_material  'XCIF (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'Phi and Omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0422
_diffrn_reflns_av_unetI/netI     0.0258
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       36
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            32191
_diffrn_reflns_theta_full        27.539
_diffrn_reflns_theta_max         27.539
_diffrn_reflns_theta_min         1.463
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  1.00
_exptl_absorpt_correction_T_min  0.96
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS (Sheldrick 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.222
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.194
_refine_diff_density_min         -0.170
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.104
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     187
_refine_ls_number_reflns         3409
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.104
_refine_ls_R_factor_all          0.0557
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0663P)^2^+0.3201P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1039
_refine_ls_wR_factor_ref         0.1230
_reflns_number_gt                2578
_reflns_number_total             3409
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b02038_si_002.cif
_cod_data_source_block           I
_cod_database_code               4033955