Synthesis of Bis-pyrrolizidine-Fused Dispiro-oxindole Analogues of Curcumin via One-Pot Azomethine Ylide Cycloaddition: Experimental and Computational Approach toward Regio- and Diastereoselection.
Bharitkar, Yogesh P.; Das, Mohua; Kumari, Neha; Kumari, M. Padma; Hazra, Abhijit; Bhayye, Sagar S.; Natarajan, Ramalingam; Shah, Siddharth; Chatterjee, Sourav; Mondal, Nirup B.; Organic letters 17 (2015) 4440–4443; doi:10.1021/acs.orglett.5b02085

data_1534125
_publ_section_title
;
 Synthesis of Bis-pyrrolizidine-Fused Dispiro-oxindole Analogues of
 Curcumin via One-Pot Azomethine Ylide Cycloaddition: Experimental and
 Computational Approach toward Regio- and Diastereoselection.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              4440
_journal_page_last               4443
_journal_paper_doi               10.1021/acs.orglett.5b02085
_journal_volume                  17
_journal_year                    2015
_chemical_formula_moiety         'C45 H44 N4 O8'
_chemical_formula_sum            'C45 H44 N4 O8'
_chemical_formula_weight         768.84
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2015-06-30
_audit_creation_method
;
Olex2 1.2
(compiled 2015.01.26 svn.r3150 for OlexSys, GUI svn.r4998)
;
_cell_angle_alpha                91.544(9)
_cell_angle_beta                 97.532(9)
_cell_angle_gamma                110.103(9)
_cell_formula_units_Z            2
_cell_length_a                   12.2439(17)
_cell_length_b                   13.8398(16)
_cell_length_c                   14.5323(18)
_cell_measurement_reflns_used    2497
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      19.59
_cell_measurement_theta_min      2.30
_cell_volume                     2285.7(5)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_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    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1096
_diffrn_reflns_av_unetI/netI     0.1388
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            37300
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        26.000
_diffrn_reflns_theta_max         26.022
_diffrn_reflns_theta_min         1.925
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.077
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6297
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/4 (Bruker,2014/4) was used for absorption correction.
wR2(int) was 0.0830 before and 0.0657 after correction.
The Ratio of minimum to maximum transmission is 0.8448.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.117
_exptl_crystal_description       block
_exptl_crystal_F_000             812
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.232
_refine_diff_density_min         -0.216
_refine_diff_density_rms         0.057
_refine_ls_extinction_coef       0.0118(18)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   0.922
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     520
_refine_ls_number_reflns         8973
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.922
_refine_ls_R_factor_all          0.1801
_refine_ls_R_factor_gt           0.0676
_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^)+(0.1117P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1804
_refine_ls_wR_factor_ref         0.2348
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3504
_reflns_number_total             8973
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol5b02085_si_002.cif
_cod_data_source_block           CL_cy_4Aa_0m_a_sq
_cod_database_code               1534125
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All N(H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C3(H3A), C4(H4A), C5(H5A), C25(H25), C26(H26), C27(H27)
2.b Secondary CH2 refined with riding coordinates:
 C6(H6A,H6B), C7(H7A,H7B), C8(H8A,H8B), C28(H28A,H28B), C29(H29A,H29B),
 C30(H30A,H30B)
2.c Aromatic/amide H refined with riding coordinates:
 N2(H2), N3(H3), C1(H1A), C12(H12), C13(H13), C14(H14), C15(H15), C18(H18),
 C19(H19), C22(H22), C33(H33), C34(H34), C35(H35), C36(H36), C40(H40), C41(H41),
  C44(H44)
2.d Idealised Me refined as rotating group:
 C23(H23A,H23B,H23C), C45(H45A,H45B,H45C)
2.e Idealised tetrahedral OH refined as rotating group:
 O1(H1), O4(H4), O5(H5)
;
_shelx_res_checksum              73637
_shelx_hkl_checksum              98228
_shelx_fab_checksum              36760
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'