Results 271 to 280 of about 3,016,957 (322)

ChemInform Abstract: HETEROCYCLIC SPIRO COMPOUNDS. SPIRO‐SUBSTITUTED BENZOTHIAZOLINES

Chemischer Informationsdienst, 1981
AbstractDurch Kondensation des Mercaptoanilins (I) mit den entsprechenden cyclischen Ketonen werden die Spiroverbindungen (II)‐(VI) dargestellt.
F. Sauter, A. Blaschke, P. Stanetty
openaire   +2 more sources

Ultrafast optical dynamics of spiro-compounds

Synthetic Metals, 2001
We report on time-resolved measurements of spiro-type molecules in the ps- and fs-timescale. Due to the orthogonality of the transition dipoles of two identical moieties connected through a spiro-atom, one expects these compounds to show two perpendicular, degenerate states that may enter into a complex free evolution upon fs excitation.
Thomas Fuhrmann, Josef Salbeck, Ch. Warmuth, Franz Milota, Jaroslaw Sperling, Harald F. Kauffmann, Andreas Tortschanoff   +6 more
openaire   +2 more sources

Synthesis of Fused or Spiro Polyheterocyclic Compounds via the Dehydrogenative Annulation Reactions of 2-Arylindazoles with Maleimides.

Organic Letters, 2019
A dehydrogenative annulation of 2-arylindazoles with maleimides for the switchable synthesis of indazolo[2,3-a]pyrrolo[3,4-c]quinolinones or spiroindolo[1,2-b]indazole-11,3'-pyrrolidinones is presented.
Chenhao Guo, Bin Li, Huilai Liu, Xiaopeng Zhang, Xinying Zhang, Xuesen Fan   +5 more
semanticscholar   +1 more source

ChemInform Abstract: Synthesis of Spiro‐Compounds Related to Fredericamycin A.

Chemischer Informationsdienst, 1986
Spiro-compounds [e.g., (8), (13)] that resemble the four central rings of the antitumour agent fredericamycin A have been synthesized by methods that are based on (i) intramolecular acylation and high-pressure Diels–Alder chemistry [(5)→(8)] or (ii) radical spiro-cyclization [e.g., (11)→(13)].
Derrick L. J. Clive, Sharon M. Bennett
openaire   +3 more sources

Synthetic, mechanistic and kinetic studies on the organo-nanocatalyzed synthesis of oxygen and nitrogen containing spiro compounds under ultrasonic conditions

, 2016
A novel class of organo-nanocatalysts was fabricated by encapsulating magnetic Fe2O3@SiO2 nanoparticles with thiamine hydrochloride. Its catalytic application in the synthesis of oxygen and nitrogen containing spiro heterocycles via ultrasonication was ...
N. Singh, Makroni Lily, S. P. Devi, Noimur Rahman, Aziz Ahmed, A. K. Chandra, R. Nongkhlaw   +6 more
semanticscholar   +1 more source

ChemInform Abstract: Enantioselective Synthesis of Oxa‐Spiro Compounds.

ChemInform, 1989
AbstractThe chiral imines (III), derived from the alkoxycyclohexanones (I), undergo Michael addition to the α,β‐unsaturated carbonyl compounds (IV), yielding the adducts (V).
Didier Desmaële, Jean d'Angelo
openaire   +3 more sources

Chiral Phosphine Oxide-Sc(OTf)3 Complex Catalyzed Enantioselective Bromoaminocyclization of 2-Benzofuranylmethyl N-Tosylcarbamates. Approach to a Novel Class of Optically Active Spiro Compounds.

Organic Letters, 2015
An efficient enantioselective bromoaminocyclization of 2-benzofuranylmethyl N-tosylcarbamates catalyzed by a chiral phosphine oxide-Sc(OTf)(3) complex is described.
Zequan Li, Yian Shi
semanticscholar   +1 more source

A Convenient Synthesis of Spiro Heterocyclic Compounds

Journal für Praktische Chemie, 1979
AbstractIsatin‐Anile, wie z.B. (I), addieren Chloressigsäurechlorid unter Bildung von Spiroverbindungen, wie z.B. der des Azetidinons (II).
Z. H. Khalil, Kh. M. Hassan
openaire   +3 more sources

Highly Efficient Asymmetric Hydrogenation Catalyzed by Iridium Complexes with Tridentate Chiral Spiro Aminophosphine Ligands.

Accounts of Chemical Research, 2023
ConspectusCatalytic asymmetric hydrogenation is one of the most reliable, powerful, and environmentally benign methods for the synthesis of chiral molecules with high atom economy and has been successfully applied in the industrial production of ...
Fan Yang, Jian-Hua Xie, Qi‐Lin Zhou
semanticscholar   +1 more source

Enantioselective methodologies for the synthesis of spiro compounds

Chem. Soc. Rev., 2012
AbstractReview: 67 refs.
openaire   +5 more sources