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Studies towards the diastereoselective spiroannulation of phenolic derivatives
Tetrahedron Letters, 2002AbstractFor Abstract see ChemInform Abstract in Full Text.
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Prins-pinacol spiroannulations
Tetrahedron, 1997Abstract Lewis acid-promoted cyclizations of methylenecyclohexane siloxy acetals 14, 15 , and 21 afford spiro[4.5]decanones 22, 25 , and 29 in good yield. In all cases, exclusive pinacol rearrangement of C-1 of the original three-carbon acetal side chain is observed suggesting that pinacol rearrangement of the intermediate 9-decalyl cation ...
Keith P. Minor, Larry E. Overman
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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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Cyclic Ketones in Spiroannulation
Synthetic Communications, 2009Abstract Conversion of a cyclic carbonyl carbon into a quaternary carbon has been effected by a Wittig–Horner reaction with diethyl (N-benzyliden)aminomethylphosphonate and a subsequent alkylation with a protected vinyl ketone. The product was a substrate for spiroannulation after initial hydrolysis.
Vidar Bj⊘rnstad, Kjell Undheim
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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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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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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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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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