Results 91 to 100 of about 490 (165)

ChemInform Abstract: Spiroannulated Cyclopropanes

ChemInform, 1997
AbstractChemInform 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
openaire   +1 more source

Rh(III)-Catalyzed C8-Spiroannulation of 1-Aminonaphthalenes with Maleimides

The Journal of Organic Chemistry, 2023
The rhodium(III)-catalyzed C8-spiroannulation of 1-aminonaphthalenes with maleimides is described herein. Initially formed C8-alkenylated 1-aminonaphthalenes can intercept nucleophilic 1-amino groups through the intramolecular aza-Michael reaction, resulting in the formation of spirofused tetracyclic frameworks. This protocol displayed a wide substrate
Eunjae Chung, Suho Kim, Amitava Rakshit, Pargat Singh, Jaewook Park, Taejoo Jeong, In Su Kim   +6 more
openaire   +2 more sources

An efficient asymmetric spiroannulation process

Tetrahedron Letters, 1989
Abstract 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, Clotilde Ferroud, Claude Riche, Angèle Chiaroni   +3 more
openaire   +1 more source

Synthesis of spiroannulated dihydroisobenzofuranylated monosaccharides

Tetrahedron Letters, 2006
Abstract 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
openaire   +1 more source

ChemInform Abstract: Cyclic Ketones in Spiroannulation.

ChemInform, 2009
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 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.
Vidar Bjoernstad, Kjell Undheim
openaire   +1 more source

Rh(III)‐Catalyzed Cascade [3+3] Spiroannulation of N‐Acyl Ketimines with Iodonium Ylides: Access to Spiro‐N,O‐Ketals

Annalen der Pharmacie
A Rh(III)‐catalyzed cascade C‐H activation/[3+3]spiroannulation of 3‐hydroxy‐3‐arylisoindolin‐1‐ones with iodonium ylides has been developed. The method facilitates the efficient and selective construction of spirocyclic compounds in a one‐pot manner ...
Jiaojiao Wen, Xia Zhang, C. Pi, Yangjie Wu, Xiuling Cui   +4 more
semanticscholar   +1 more source

Synthesis of Highly Functionalized Indolizines via NIS-Promoted Spiroannulation/Ring-Opening Aromatization of Alkylidene Oxindoles with 2-(Pyridin-2-yl)acetate Derivatives.

Journal of Organic Chemistry
A novel NIS-promoted domino reaction of alkylidene oxindoles with 2-(pyridin-2-yl)acetate derivatives has been established, enabling the efficient and straightforward synthesis of a vast variety of highly functionalized indolizines via sequential ...
Luan-Ting Wu, Honglin Diao, Yi Wu, Junning Shu, Zeng-Yang He, Peng Xu, Si Chen, Pinhua Li, Ze Zhang, Hui Xu   +9 more
semanticscholar   +1 more source

.alpha.-Substitution-spiroannulation of saturated ketones

Journal of the American Chemical Society, 1983
α-Substitution-spiroannelation de la cyclopentanone.
Barry M. Trost, Michael K. T. Mao
openaire   +1 more source

Rh(III)-Catalyzed Spiroannulation Reaction of N-Aryl Nitrones with 2-Diazo-1,3-indandiones: Synthesis of Spirocyclic Indole-N-oxides and Their 1,3-Dipolar Cycloaddition with Maleimides.

Journal of Organic Chemistry, 2023
An efficient strategy for the preparation of spirocyclic indole-N-oxide compounds through a Rh(III)-catalyzed [4 + 1] spiroannulation reaction of N-aryl nitrones with 2-diazo-1,3-indandiones as C1 synthons under extremely mild conditions is presented ...
Shenghai Guo, Ziyi Zhang, Zhaotong Wei, Yuanqing Zhu, Xuesen Fan   +4 more
semanticscholar   +1 more source

Ru(II)-catalyzed oxidative C-H spiroannulation of 4-arylquinazolin-2-ones with alkynes.

Organic and biomolecular chemistry
A novel strategy has been devised for the synthesis of spiro[indene-1,4'-quinazolin]-2'(3'H)-one frameworks through Ru(II)-catalyzed tandem ortho-C-H bond activation and spiroannulation of 4-arylquinazolin-2-ones with alkynes.
Ajay Chidrawar, S. Balasubramanian, Venkata Subba Reddy Basireddy   +2 more
semanticscholar   +1 more source