Highly Selective Synthesis of Pyrazole and Spiropyrazoline Phosphonates via Base-Assisted Reaction of the Bestmann-Ohira Reagent with Enones
Deepti Verma; Shaikh Mobin; Irishi N. N. Namboothiri; Journal of Organic Chemistry 76 (2011) 4764–4770; doi:10.1021/jo200582z

data_4026376
_publ_section_title
;
 Highly Selective Synthesis of Pyrazole and Spiropyrazoline Phosphonates
 via Base-Assisted Reaction of the Bestmann-Ohira Reagent with Enones
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              4764
_journal_page_last               4770
_journal_paper_doi               10.1021/jo200582z
_journal_volume                  76
_journal_year                    2011
_chemical_formula_sum            'C20 H20 Cl N2 O4 P'
_chemical_formula_weight         418.80
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_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
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                89.691(8)
_cell_angle_beta                 73.870(9)
_cell_angle_gamma                65.588(11)
_cell_formula_units_Z            2
_cell_length_a                   9.8119(11)
_cell_length_b                   10.4520(12)
_cell_length_c                   11.1999(10)
_cell_measurement_reflns_used    3891
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      32.8299
_cell_measurement_theta_min      3.3591
_cell_volume                     996.8(2)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd.,'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd.,'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd.,'
_computing_molecular_graphics    Ortep3
_computing_publication_material  Shelx97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 15.9948
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'OXFORD DIFFRACTION XCALIBUR-S'
_diffrn_measurement_method       \w/q-scan
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0436
_diffrn_reflns_av_sigmaI/netI    0.0597
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            7382
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.37
_exptl_absorpt_coefficient_mu    0.301
_exptl_absorpt_correction_T_max  0.9619
_exptl_absorpt_correction_T_min  0.9340
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.31.7 (release 18-10-2006 CrysAlis171 .NET)
(compiled Oct 18 2006,16:28:17)
empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.395
_exptl_crystal_description       block
_exptl_crystal_F_000             436
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.238
_refine_diff_density_min         -0.350
_refine_diff_density_rms         0.060
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.920
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         3504
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.920
_refine_ls_R_factor_all          0.0716
_refine_ls_R_factor_gt           0.0437
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0638P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1026
_refine_ls_wR_factor_ref         0.1094
_reflns_number_gt                2370
_reflns_number_total             3504
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo200582z_si_002.cif
_cod_data_source_block           inn037
_cod_original_cell_volume        996.84(18)
_cod_database_code               4026376