Diastereoselective Ireland-Claisen rearrangements of substituted allyl β-amino esters: applications in the asymmetric synthesis of C(5)-substituted transpentacins.
Davies, Stephen G.; Fletcher, Ai M.; Lee, James A.; Roberts, Paul M.; Souleymanou, Myriam Y.; Thomson, James E.; Zammit, Charlotte M.; Organic & biomolecular chemistry 12 (2014) 2702–2728; doi:10.1039/c4ob00274a

data_7153727
_publ_section_title
;
 Diastereoselective Ireland-Claisen rearrangements of substituted allyl
 \b-amino esters: applications in the asymmetric synthesis of
 C(5)-substituted transpentacins.
;
_journal_issue                   17
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2702
_journal_page_last               2728
_journal_paper_doi               10.1039/c4ob00274a
_journal_volume                  12
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C16 H25 N1 O2'
_chemical_formula_sum            'C16 H25 N O2'
_chemical_formula_weight         263.38
_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   difmap
_atom_sites_solution_primary     direct
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.66504(13)
_cell_length_b                   9.9818(2)
_cell_length_c                   18.4067(4)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    150
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     1592.05(5)
_computing_cell_refinement       'CrysAlis, (Oxford Diffraction, 2002)'
_computing_data_collection       'SuperNova, (Oxford Diffraction, 2010)'
_computing_data_reduction        'CrysAlis, (Oxford Diffraction, 2002)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Oxford Diffraction SuperNova'
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.024
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            7321
_diffrn_reflns_theta_full        74.858
_diffrn_reflns_theta_max         76.386
_diffrn_reflns_theta_min         4.805
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.562
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.099
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             576
_exptl_crystal_size_max          0.210
_exptl_crystal_size_mid          0.190
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.15
_refine_diff_density_min         -0.17
_refine_ls_abs_structure_details 'Flack (1983), 0 Friedel-pairs'
_refine_ls_abs_structure_Flack   -0.02(13)
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0003
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     173
_refine_ls_number_reflns         7067
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0339
_refine_ls_R_factor_gt           0.0323
_refine_ls_shift/su_max          0.0003703
_refine_ls_shift/su_mean         0.0000513
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method= Modified Sheldrick 
 w=1/[\s^2^(F^2^) + ( 0.04P)^2^ + 0.18P] 
 ,where P=(max(Fo^2^,0) + 2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0839
_refine_ls_wR_factor_gt          0.0811
_refine_ls_wR_factor_ref         0.0826
_reflns_limit_h_max              10
_reflns_limit_h_min              -10
_reflns_limit_k_max              12
_reflns_limit_k_min              0
_reflns_limit_l_max              23
_reflns_limit_l_min              0
_reflns_number_gt                6792
_reflns_number_total             1913
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   3.09
_oxford_diffrn_Wilson_scale      0.02
_oxford_refine_ls_r_factor_ref   0.0338
_oxford_refine_ls_scale          6.41(9)
_oxford_reflns_number_all        7068
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_cod_data_source_file            c4ob00274a2.cif
_cod_data_source_block           18
_cod_original_cell_volume        1592.04(5)
_cod_original_formula_sum        'C16 H25 N1 O2'
_cod_database_code               7153727
_iucr_refine_instruction_details_constraints
;
BLOCK SCALE X'S, U'S 
CONT ENANTIO 
RIDE C   (   4,X'S) H   (  41,X'S) H   (  43,X'S) H   (  42,X'S) 
RIDE C   (   5,X'S) H   (  51,X'S) 
RIDE C   (   6,X'S) H   (  61,X'S) 
RIDE N   (   7,X'S) H   (  71,X'S) 
RIDE C   (   8,X'S) H   (  81,X'S) 
RIDE C   (   9,X'S) H   (  93,X'S) H   (  92,X'S) H   (  91,X'S) 
RIDE C   (  10,X'S) H   ( 103,X'S) H   ( 102,X'S) H   ( 101,X'S) 
RIDE C   (  12,X'S) H   ( 121,X'S) 
RIDE C   (  13,X'S) H   ( 131,X'S) 
RIDE C   (  14,X'S) H   ( 141,X'S) 
RIDE C   (  15,X'S) H   ( 151,X'S) 
RIDE C   (  16,X'S) H   ( 161,X'S) 
RIDE C   (  17,X'S) H   ( 171,X'S) H   ( 172,X'S) 
RIDE C   (  18,X'S) H   ( 182,X'S) H   ( 181,X'S) 
RIDE C   (  19,X'S) H   ( 193,X'S) H   ( 192,X'S) H   ( 191,X'S) 
END                                                                             
;
_iucr_refine_instruction_details_restraints
;
NO 
REM   HREST   START (DO NOT REMOVE THIS LINE) 
REM   HREST   END (DO NOT REMOVE THIS LINE) 
END                                                                             
;