Stereoselective Synthesis of Tetrahydrofurans via Formal [3+2]-Cycloaddition of Aldehydes and Allylsilanes. Formal Total Synthesis of the Muscarine Alkaloids (-)-Allomuscarine and (+)-Epimuscarine
Steven R. Angle; Nahla A. El-Said; Journal of the American Chemical Society 124 (2002) 3608–3613; doi:10.1021/ja012193b

data_4114718
_publ_section_title
;
 Stereoselective Synthesis of Tetrahydrofurans via Formal
 [3+2]-Cycloaddition of Aldehydes and Allylsilanes. Formal Total Synthesis
 of the Muscarine Alkaloids (-)-Allomuscarine and (+)-Epimuscarine
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              3608
_journal_page_last               3613
_journal_paper_doi               10.1021/ja012193b
_journal_volume                  124
_journal_year                    2002
_chemical_formula_sum            'C26 H22 N2 O9'
_chemical_formula_weight         506.46
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 102.938(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   21.832(3)
_cell_length_b                   16.948(3)
_cell_length_c                   13.0648(19)
_cell_measurement_temperature    213(2)
_cell_volume                     4711.4(13)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      213(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0280
_diffrn_reflns_av_sigmaI/netI    0.0248
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            14022
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         1.54
_exptl_absorpt_coefficient_mu    0.109
_exptl_crystal_density_diffrn    1.428
_exptl_crystal_F_000             2112
_refine_diff_density_max         0.223
_refine_diff_density_min         -0.158
_refine_diff_density_rms         0.032
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     335
_refine_ls_number_reflns         4832
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0495
_refine_ls_R_factor_gt           0.0360
_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^)+(0.0581P)^2^+1.2893P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0972
_refine_ls_wR_factor_ref         0.1060
_reflns_number_gt                3759
_reflns_number_total             4832
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja012193b_s8_3.cif
_cod_data_source_block           sa121m
_cod_original_cell_volume        4711.3(12)
_cod_database_code               4114718