Results 111 to 120 of about 337 (160)
Synlett, 2001 An efficient ring closing metathesis (RCM.) reaction based approach was developed for the spiroannulation of cyclopentanes and cyclohexanes and its utility demonstrated in the formal synthesis of the spirosesquiterpenes ...
M Srinivasa Rao, Santosh J Gharpure
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Dearomatizing [2+2+1] Spiroannulation of Indoles with Alkynes
Organic Letters, 2022A palladium-catalyzed dearomatizing [2+2+1] spiroannulation of indoles with two molecular internal alkynes is developed in the presence of Cu(OAc)2/O2 as the oxidant, in which a domino sequence including C-H activation of indole followed by consecutive Heck reactions is involved.
Xiao-Qing Han +4 more
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Spiroannulation by Alkylation and Reductive Cyclization of Nitriles
Angewandte Chemie International Edition, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
Scott D, Rychnovsky, Leo R, Takaoka
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The Journal of Organic Chemistry, 2023
A novel [4 + 1] and [5 + 1] dearomative spiroannulation has been developed by the use of commercial naphthols and phenols with dielectrophiles. Various spirocycles, including spiro[4.5] and spiro[5.5] have been constructed successfully by employing four-atom or five-atom dielectrophilic synthons.
Dongwei Zhao +4 more
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A novel [4 + 1] and [5 + 1] dearomative spiroannulation has been developed by the use of commercial naphthols and phenols with dielectrophiles. Various spirocycles, including spiro[4.5] and spiro[5.5] have been constructed successfully by employing four-atom or five-atom dielectrophilic synthons.
Dongwei Zhao +4 more
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Efficient and Convergent Stereocontrolled Spiroannulation of Ketones.
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
István E. Markó +4 more
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Regioselective Spiroannulations of α-Acetyl Lactones.
ChemInform, 2003AbstractMonocyclic spiroannulation precursors 3a−c were obtained by Michael reactions of α‐acetyl lactones 6a−c with methyl vinyl ketone (7). The selective formation of either regioisomer of both β‐oxo (5a−c) and δ‐oxo (4a−c) lactones from 3a−c was achieved by varying the reaction conditions. The δ‐oxo lactones 4a−c were obtained under basic (buffered)
Jens Christoffers +2 more
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A chemo- and regioselective Pd(0)-catalyzed three-component spiroannulation
Chemical Communications, 2021A novel Pd(0)-catalyzed three-component [2+2+1] dearomatizing reaction for the highly chemo- and regio-selective assembly of spirocarbocycles is described.
Jiaoyu Wu +4 more
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ChemInform Abstract: Spiroannulated Cyclopropanes
ChemInform, 1997AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
K. A. LUKIN, N. S. ZEFIROV
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An efficient asymmetric spiroannulation process
Tetrahedron Letters, 1989Abstract After hydrolytic work-up, intramolecular Michael-type alkylation of imine 11 gave spiro adduct 13 with a high degree of control of the two newly created asymmetric centers.
Jean d'Angelo +3 more
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Synthesis of spiroannulated dihydroisobenzofuranylated monosaccharides
Tetrahedron Letters, 2006Abstract An efficient synthesis of spiroannulated dihydroisobenzofurans is achieved using easily accessible carbohydrate-derived furanyl propargyl ethers via an AuCl 3 promoted intramolecular Diels–Alder (IMDA) reaction. The scope of the spiroannulation protocol was demonstrated using a diverse range of pentofuranosyl, hexofuransoyl and ...
Sushil K. Maurya, Srinivas Hotha
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