Divergent access to polycyclic spiro- and fused-<i>N</i>,O-ketals through Bi(OTf)<sub>3</sub>-catalyzed [4+2]-annulation of cyclic <i>N</i>-sulfonyl ketimines and alkynols.
Nakate, Ashwini K.; Kataria, Priyanka; Sambherao, Pooja I.; Krishna, Gamidi Rama; Kontham, Ravindar; Chemical communications (Cambridge, England) 60 (2024) 1144–1147; doi:10.1039/d3cc05599j

data_7132572
_publ_section_title
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 Divergent access to polycyclic spiro- and fused-<i>N</i>,O-ketals through
 Bi(OTf)<sub>3</sub>-catalyzed [4+2]-annulation of cyclic
 <i>N</i>-sulfonyl ketimines and alkynols.
;
_journal_issue                   9
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_journal_paper_doi               10.1039/d3cc05599j
_journal_volume                  60
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;
2022-07-08 deposited with the CCDC.	2023-12-27 downloaded from the CCDC.
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_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'
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_refine_ls_restrained_S_all      1.188
_refine_ls_R_factor_all          0.0367
_refine_ls_R_factor_gt           0.0338
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
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'w=1/[\s^2^(Fo^2^)+(0.0599P)^2^+0.8183P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_reflns_Friedel_coverage         0.000
_reflns_number_gt                4173
_reflns_number_total             4308
_reflns_threshold_expression     'I > 2\s(I)'
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'Adding full bibliography for 7132570--7132573.cif.'
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