Ugi multicomponent reactions of optically active aldehydes and chiral aminoindanols: diastereoselective synthesis of bisamides relevant to SARS-CoV-2 Mpro inhibitors.
Ghosh, Arun K.; Bhattacharjee, Amlan; Jayashankar, Uttara; Bogan, Sydney N.; Mesecar, Andrew D.; Organic & biomolecular chemistry 24 (2026) 2542–2558; doi:10.1039/d5ob01897h

data_7161054
_publ_section_title
;
 Ugi multicomponent reactions of optically active aldehydes and chiral
 aminoindanols: diastereoselective synthesis of bisamides relevant to
 SARS-CoV-2 Mpro inhibitors.
;
_journal_issue                   12
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2542
_journal_page_last               2558
_journal_paper_doi               10.1039/d5ob01897h
_journal_volume                  24
_journal_year                    2026
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C27 H42 N4 O4 Si'
_chemical_formula_sum            'C27 H42 N4 O4 Si'
_chemical_formula_weight         514.73
_chemical_name_systematic
;
N-((2R,3R)-1-(tert-butylamino)-3-((tert-butyldimethylsilyl)oxy)-1-oxobutan-2-
yl)-N-((1S,2R)-2-hydroxy-2,3-dihydro-1H-inden-1-yl)-1H-imidazole-4-carboxamide
;
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2019/3
_audit_update_record
;
2025-07-18 deposited with the CCDC.	2026-02-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.6830(6)
_cell_length_b                   16.9749(11)
_cell_length_c                   18.0741(11)
_cell_measurement_reflns_used    2087
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      77.8605
_cell_measurement_theta_min      3.5721
_cell_volume                     2970.8(3)
_computing_cell_refinement       'SAINT V8.40B (Bruker, 2020)'
_computing_data_collection       'Apex5 v2023.9-2 (Bruker, 2023)'
_computing_data_reduction        'SAINT V8.40B (Bruker, 2020)'
_computing_structure_refinement
;
 SHELXL-2019/2 (Sheldrick, 2015a, 2019),
 SHELXLE Rev1613 (H\"ubschle et al., 2011)
;
_computing_structure_solution    'SHELXT (Sheldrick, 2015b)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 7.4074
_diffrn_detector_type
'PhotonIII_C14 charge-integrating and photon counting pixel array'
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.953
_diffrn_measurement_device       'four circle diffractometer'
_diffrn_measurement_device_type  'Bruker AXS D8 Quest'
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  'HELIOS multilayer Montel optics'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0793
_diffrn_reflns_av_unetI/netI     0.0823
_diffrn_reflns_Laue_measured_fraction_full 0.991
_diffrn_reflns_Laue_measured_fraction_max 0.953
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            15375
_diffrn_reflns_point_group_measured_fraction_full 0.976
_diffrn_reflns_point_group_measured_fraction_max 0.913
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         80.192
_diffrn_reflns_theta_min         3.572
_diffrn_source                   'I-mu-S 3.0 microsource X-ray tube'
_diffrn_source_current           '1.1 mA'
_diffrn_source_voltage           '50 kV'
_exptl_absorpt_coefficient_mu    0.987
_exptl_absorpt_correction_T_max  0.7543
_exptl_absorpt_correction_T_min  0.6331
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 SADABS 2016/2: Krause, L., Herbst-Irmer, R., Sheldrick G.M. & Stalke D.,
 J. Appl. Cryst. 48 (2015) 3-10
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.151
_exptl_crystal_description       needle
_exptl_crystal_F_000             1112
_exptl_crystal_size_max          0.135
_exptl_crystal_size_mid          0.019
_exptl_crystal_size_min          0.009
_refine_diff_density_max         0.256
_refine_diff_density_min         -0.232
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details
;
 Flack x determined using 1384 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.03(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     336
_refine_ls_number_reflns         5918
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0872
_refine_ls_R_factor_gt           0.0541
_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^)+(0.0526P)^2^+0.2046P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1167
_refine_ls_wR_factor_ref         0.1335
_reflns_Friedel_coverage         0.705
_reflns_Friedel_fraction_full    0.956
_reflns_Friedel_fraction_max     0.861
_reflns_number_gt                4314
_reflns_number_total             5918
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5ob01897h2.cif
_cod_data_source_block           AB_02_141_A_0m_a
_cod_depositor_comments
'Adding full bibliography for 7161052--7161055.cif.'
_cod_database_code               7161054
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_min   0.878
_shelx_estimated_absorpt_t_max   0.991
_shelx_res_checksum              44257