Synthesis of Difluoroalkyl Unsaturated β-Amino Acid Derivatives Exclusively through Alkyne Difunctionalization.
Wang, Qiang; Jin, Jia-Ni; Chen, Xi; Wang, Xin-Gang; Zhang, Bo-Sheng; Ma, Jun-Wei; Liang, Yong-Min; The Journal of organic chemistry 83 (2018) 14626–14636; doi:10.1021/acs.joc.8b02440

data_4035694
_publ_section_title
;
 Synthesis of Difluoroalkyl Unsaturated \b-Amino Acid Derivatives
 Exclusively through Alkyne Difunctionalization.
;
_journal_issue                   23
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              14626
_journal_page_last               14636
_journal_paper_doi               10.1021/acs.joc.8b02440
_journal_volume                  83
_journal_year                    2018
_chemical_formula_moiety         'C36 H30 F4 O4'
_chemical_formula_sum            'C36 H30 F4 O4'
_chemical_formula_weight         602.60
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2018-07-30
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 105.657(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.5468(8)
_cell_length_b                   10.6086(5)
_cell_length_c                   16.1722(7)
_cell_measurement_reflns_used    9975
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      66.49
_cell_measurement_theta_min      2.84
_cell_volume                     2898.7(2)
_computing_cell_refinement       'SAINT V8.38A (?, 2016)'
_computing_data_reduction        'SAINT V8.38A (?, 2016)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      150.01
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0561
_diffrn_reflns_av_unetI/netI     0.0514
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            18745
_diffrn_reflns_theta_full        66.59
_diffrn_reflns_theta_max         66.59
_diffrn_reflns_theta_min         4.92
_diffrn_source                   'fine-focus sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.892
_exptl_absorpt_correction_T_max  0.7528
_exptl_absorpt_correction_T_min  0.6207
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.0933 before and 0.0779 after correction. The Ratio of minimum to maximum transmission is 0.8245. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.381
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1256
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.17
_refine_diff_density_max         0.334
_refine_diff_density_min         -0.272
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     399
_refine_ls_number_reflns         5081
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0549
_refine_ls_R_factor_gt           0.0505
_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^)+(0.0595P)^2^+1.7005P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1311
_refine_ls_wR_factor_ref         0.1352
_reflns_number_gt                4545
_reflns_number_total             5081
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo8b02440_si_006.cif
_cod_data_source_block           20180316_wangqiang_chofn_0ma_a
_cod_database_code               4035694
_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 Secondary CH2 refined with riding coordinates:
 C17(H17A,H17B), C31(H31A,H31B), C34(H34A,H34B), C36(H36A,H36B)
2.b Aromatic/amide H refined with riding coordinates:
 C3(H3), C4(H4), C5(H5), C6(H6), C9(H9), C10(H10), C12(H12), C11(H11),
 C19(H19), C20(H20), C21(H21), C22(H22), C27(H27), C28(H28), C29(H29), C30(H30)
2.c Idealised Me refined as rotating group:
 C14(H14A,H14B,H14C), C35(H35A,H35B,H35C)
;
_olex2_submission_special_instructions 'No special instructions were received'