Total synthesis of cryptophycin analogues via a scaffold approach.
McCubbin, J. Adam; Maddess, Matthew L.; Lautens, Mark; Organic letters 8 (2006) 2993–2996; doi:10.1021/ol0609356

data_1506037
_publ_section_title
;
 Total synthesis of cryptophycin analogues via a scaffold approach.
;
_journal_issue                   14
_journal_name_full               'Organic letters'
_journal_page_first              2993
_journal_page_last               2996
_journal_paper_doi               10.1021/ol0609356
_journal_volume                  8
_journal_year                    2006
_chemical_absolute_configuration rmad
_chemical_formula_moiety
'C35 H41 Cl N2 O7, 0.65(C H Cl3), 0.35(C5 H12)'
_chemical_formula_sum            'C37.4 H45.85 Cl2.95 N2 O7'
_chemical_formula_weight         739.99
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4580(3)
_cell_length_b                   17.8240(5)
_cell_length_c                   21.1220(7)
_cell_measurement_reflns_used    28907
_cell_measurement_temperature    150(1)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.7
_cell_volume                     3937.2(2)
_computing_cell_refinement       'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2003)'
_computing_data_reduction        Denzo-SMN
_computing_molecular_graphics    'SHELXTL V6.12'
_computing_publication_material  'SHELXTL V6.12'
_computing_structure_refinement  'SHELXTL V6.12(Sheldrick, 2001)'
_computing_structure_solution    'SIR-92 (Altomare et al., 1993)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker-Nonius KappaCCD'
_diffrn_measurement_method       '\f scans and \w scans with \k offsets'
_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  0.0665
_diffrn_reflns_av_sigmaI/netI    0.0735
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            28907
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.74
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.277
_exptl_absorpt_correction_T_max  1.041
_exptl_absorpt_correction_T_min  0.763
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1562
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.217
_refine_diff_density_min         -0.289
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.02(6)
_refine_ls_extinction_coef       0.0059(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   1.038
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     472
_refine_ls_number_reflns         8968
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.1032
_refine_ls_R_factor_gt           0.0479
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0494P)^2^+0.4355P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0953
_refine_ls_wR_factor_ref         0.1167
_reflns_number_gt                5791
_reflns_number_total             8968
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol0609356si20060606_065520.cif
_cod_data_source_block           k05130
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_formula_sum        'C37.40 H45.85 Cl2.95 N2 O7'
_cod_database_code               1506037