Regioselective ring expansion of 3-ylideneoxindoles with tosyldiazomethane (TsDAM) : A metal-free and greener approach for the synthesis of pyrazolo-[1,5-c]quinazolines.
Ramu, Gopathi; Tangella, Yellaiah; Ambala, Srinivas; Nagendra Babu, Bathini; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.0c00078

data_4038243
_publ_section_title
;
 Regioselective ring expansion of 3-ylideneoxindoles with
 tosyldiazomethane (TsDAM) : A metal-free and greener approach for the
 synthesis of pyrazolo-[1,5-c]quinazolines.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.0c00078
_journal_year                    2020
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_cell_length_c                   15.020(5)
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1000P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1671
_refine_ls_wR_factor_ref         0.1764
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_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo0c00078_si_002.cif
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_cod_original_cell_volume        1167.0(5)
_cod_original_sg_symbol_H-M      'P 21/n'
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_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.955
_shelx_estimated_absorpt_t_max   0.980
_shelx_res_checksum              32747
_shelx_hkl_checksum              81373