474003-61-7Relevant articles and documents
Intramolecular cycloaddition of O-tert-butyldimethylsilyloximes in the presence of BF3-OEt2
Tamura, Osamu,Mitsuya, Takahiro,Huang, Xin,Tsutsumi, Yoshiyuki,Hattori, Sanae,Ishibashi, Hiroyuki
, p. 10720 - 10725 (2007/10/03)
Intramolecular cycloaddition of novel 1,3-dipoles, N-boranonitrones, was examined. Treatment of O-tert-butyldimethylsilyloximes 9-12 having olefin moieties with 2 equiv of BF3·OEt2 generated N-boranonitrones, which underwent intramolecular cycloaddition to afford N-nonsubstituted cycloadducts 16 (and/or 18) after extractive workup. Despite the Lewis-acidic conditions, the olefin geometry of the substrates was retained in the cycloadducts in the present cycloaddition. The electronic nature of the N-boranonitrones appeared to be electrophilic. In the case of substrate 11c, having an electron-donating methyl group at an internal position of the olefin moiety, the cycloaddition gave the bridged cycloadduct 18b. The cycloaddition proceeded at relatively low temperature, and the diastereoselectivity was high.