Phosphine-Catalyzed Doubly Stereoconvergent γ-Additions of Racemic Heterocycles to Racemic Allenoates: The Catalytic Enantioselective Synthesis of Protected α,α-Disubstituted α-Amino Acid Derivatives.
Kalek, Marcin; Fu, Gregory C.; Journal of the American Chemical Society 137 (2015) 9438–9442; doi:10.1021/jacs.5b05528

data_4124152
_publ_section_title
;
 Phosphine-Catalyzed Doubly Stereoconvergent \g-Additions of Racemic
 Heterocycles to Racemic Allenoates: The Catalytic Enantioselective
 Synthesis of Protected \a,\a-Disubstituted \a-Amino Acid Derivatives.
;
_journal_issue                   29
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9438
_journal_page_last               9442
_journal_paper_doi               10.1021/jacs.5b05528
_journal_volume                  137
_journal_year                    2015
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C37 H51 N3 O4'
_chemical_formula_sum            'C37 H51 N3 O4'
_chemical_formula_weight         601.80
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2015-05-22
_audit_creation_method
;
Olex2 1.2
(compiled 2015.01.26 svn.r3150 for OlexSys, GUI svn.r4998)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.3317(3)
_cell_length_b                   11.0488(3)
_cell_length_c                   31.0607(8)
_cell_measurement_reflns_used    9631
_cell_measurement_temperature    100
_cell_measurement_theta_max      78.55
_cell_measurement_theta_min      2.85
_cell_volume                     3545.67(17)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker DUO CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0681
_diffrn_reflns_av_unetI/netI     0.0234
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       39
_diffrn_reflns_limit_l_min       -39
_diffrn_reflns_number            112215
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         79.444
_diffrn_reflns_theta_min         2.845
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.575
_exptl_absorpt_correction_T_max  0.7491
_exptl_absorpt_correction_T_min  0.6922
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/5 (Bruker,2014/5) was used for absorption correction.
wR2(int) was 0.1282 before and 0.0769 after correction.
The Ratio of minimum to maximum transmission is 0.9240.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.127
_exptl_crystal_F_000             1304
_refine_diff_density_max         0.539
_refine_diff_density_min         -0.299
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details
;
 Flack x determined using 2768 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.08(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     406
_refine_ls_number_reflns         7623
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0520
_refine_ls_R_factor_gt           0.0448
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0508P)^2^+1.3328P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1068
_refine_ls_wR_factor_ref         0.1111
_reflns_Friedel_coverage         0.772
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.985
_reflns_number_gt                6870
_reflns_number_total             7623
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja5b05528_si_001.cif
_cod_data_source_block           crystal_04
_cod_depositor_comments
'Adding full bibliography for 4124149--4124153.cif.'
_cod_database_code               4124152
_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:
 C15(H15), C18(H18), C21(H21)
2.b Secondary CH2 refined with riding coordinates:
 C5(H5A,H5B), C6(H6A,H6B), C7(H7A,H7B), C8(H8A,H8B), C25(H25A,H25B), C26(H26A,
 H26B)
2.c Aromatic/amide H refined with riding coordinates:
 C11(H11), C12(H12), C13(H13), C22(H22), C23(H23), C33(H33), C34(H34),
 C36(H36), C37(H37)
2.d Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C17(H17A,H17B,H17C), C19(H19A,H19B,H19C), C20(H20A,H20B,
 H20C), C27(H27A,H27B,H27C), C29(H29A,H29B,H29C), C30(H30A,H30B,H30C), C31(H31A,
 H31B,H31C), C38(H38A,H38B,H38C)
;
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'