Synthesis and Biological Evaluation of Epidithio-, Epitetrathio-, and bis-(Methylthio)diketopiperazines: Synthetic Methodology, Enantioselective Total Synthesis of Epicoccin G, 8,8'-epi-ent-Rostratin B, Gliotoxin, Gliotoxin G, Emethallicin E, and Haematocin and Discovery of New Antiviral and Antimalarial Agents
K. C. Nicolaou; Min Lu; Sotirios Totokotsopoulos; Philipp Heretsch; Denis Giguère; Ya-Ping Sun; David Sarlah; Thu H. Nguyen; Ian C. Wolf; Donald F. Smee; Craig W. Day; Selina Bopp; Elizabeth A. Winzeler; Journal of the American Chemical Society 134 (2012) 17320–17332; doi:10.1021/ja308429f

data_4118782
_publ_section_title
;
 Synthesis and Biological Evaluation of Epidithio-, Epitetrathio-, and
 bis-(Methylthio)diketopiperazines: Synthetic Methodology,
 Enantioselective Total Synthesis of Epicoccin G, 8,8'-epi-ent-Rostratin
 B, Gliotoxin, Gliotoxin G, Emethallicin E, and Haematocin and Discovery
 of New Antiviral and Antimalarial Agents
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17320
_journal_page_last               17332
_journal_paper_doi               10.1021/ja308429f
_journal_volume                  134
_journal_year                    2012
_chemical_formula_sum            'C20 H20 N2 O2 S4'
_chemical_formula_weight         448.62
_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                 96.7730(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.2084(5)
_cell_length_b                   30.7322(18)
_cell_length_c                   7.3395(4)
_cell_measurement_reflns_used    5072
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.43
_cell_measurement_theta_min      2.23
_cell_volume                     2062.5(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-I CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0433
_diffrn_reflns_av_sigmaI/netI    0.0322
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       36
_diffrn_reflns_limit_k_min       -36
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            19914
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.33
_exptl_absorpt_coefficient_mu    0.480
_exptl_absorpt_correction_T_max  0.9905
_exptl_absorpt_correction_T_min  0.9018
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1999)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.445
_exptl_crystal_description       Plate-like
_exptl_crystal_F_000             936
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.182
_refine_diff_density_min         -0.207
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.084
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         3633
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.084
_refine_ls_R_factor_all          0.0528
_refine_ls_R_factor_gt           0.0392
_refine_ls_shift/su_max          0.024
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0400P)^2^+1.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0914
_refine_ls_wR_factor_ref         0.1071
_reflns_number_gt                2928
_reflns_number_total             3633
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja308429f_si_002.cif
_cod_data_source_block           stri_0ma
_cod_database_code               4118782