Transition-Metal-Free Cyclopropanation of 2-Aminoacrylates with N-Tosylhydrazones: A General Route to Cyclopropane α-Amino Acid with Contiguous Quaternary Carbon Centers.
Zhu, Chuanle; Li, Jiawei; Chen, Pengquan; Wu, Wanqing; Ren, Yanwei; Jiang, Huanfeng; Organic letters 18 (2016) 1470–1473; doi:10.1021/acs.orglett.6b00416

data_1542745
_publ_section_title
;
 Transition-Metal-Free Cyclopropanation of 2-Aminoacrylates with
 N-Tosylhydrazones: A General Route to Cyclopropane \a-Amino Acid with
 Contiguous Quaternary Carbon Centers.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1470
_journal_page_last               1473
_journal_paper_doi               10.1021/acs.orglett.6b00416
_journal_volume                  18
_journal_year                    2016
_chemical_formula_sum            'C16 H19 N O5'
_chemical_formula_weight         305.32
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 95.42(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.8082(18)
_cell_length_b                   19.624(4)
_cell_length_c                   9.7487(19)
_cell_measurement_reflns_used    11292
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      55.03
_cell_measurement_theta_min      6.23
_cell_volume                     1677.5(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  Rigaku
_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  0.0524
_diffrn_reflns_av_sigmaI/netI    0.0431
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            18879
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.12
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.9910
_exptl_absorpt_correction_T_min  0.9910
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.209
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.213
_refine_diff_density_min         -0.289
_refine_diff_density_rms         0.052
_refine_ls_extinction_coef       0.026(6)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.952
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         2950
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.952
_refine_ls_R_factor_all          0.0975
_refine_ls_R_factor_gt           0.0652
_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^)+(0.1435P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1822
_refine_ls_wR_factor_ref         0.2244
_reflns_number_gt                1491
_reflns_number_total             2950
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol6b00416_si_002.cif
_cod_data_source_block           z-2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4268 2015-11-12 08:31:59Z antanas 

 Adding full bibliography for 1542744--1542745.cif.
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               1542745