Global ETD Search
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Showing 1 to 8 of 8 for “"Annulations"”.
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Alternatives to [4+1] carbocyclic annulations
6-Carboethoxybicyclo [3.3.0] oct-6-en-2-one has been prepared by the intramolecular [4+1] cyclopentene annulation method. This compound and its precursor, 6-vinyl-6-carboethoxybicyclo[3.1.0]hexan-2-one were attained as the necessary standards for the investigation of the course of intramolecular …
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Lewis Base Promoted Annulations of Allenoates with 1,4-Naphthoquinones
… and amine Lewis bases offer interesting annulations with allenoates resulting in Lu or Morita–Baylis–Hillman type reactions. Once the Lewis base engages with the allenoate there can be several modes of nucleophilic reactivity that allows for the allenic ester to act as a two or three …
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Stress relief: Exercising Lewis acid catalysis for donor-acceptor cyclopropane ring-opening annulations, a basis for new reaction methodologies
Nature’s biodiversity is complex and filled with beauty and wonder which are all observable on the macroscopic scale. This exquisiteness of nature’s intricacies are mirrored on the molecular level such that substances, large or small, are assembled to serve as signaling molecules, protective …
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Paleobiology of the Early Cambrian Yanjiahe Formation in Hubei Province of South China
… The arrangement of these grooves resembles annulations found on the surface of the Cambrian-Ordovician fossil embryo Markuelia. Previously described late-stage Markuelia embryos exhibit annulations and an introvert ornamented by scalids, suggesting a scalidophoran affinity. In the Yanjiahe …
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Design and Development of New Catalytic Carbon-Carbon Bond Forming Reactions: I. N-Heterocyclic Carbene Based Catalytic Platform for Hauser-Kraus Annulations II. Copper-Catalyzed Selective Allylic Alkylation of Allylic Systems Using Grignard Reagents
The construction of carbon-carbon bonds has always been at the forefront of synthetic organic chemistry for generating products of greater utilities. Owing to their extraordinary applications in the synthesis of a wide range of therapeutic small molecules and natural products, the design and the …
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Synthesis and Spectroscopic Studies of Substituted Pyrrolocytidines
… was achieved through the tandem Sonogashira/annulations reaction between 5-iodocytidine derivatives and terminal alkynes to yield the bicyclic nucleoside pyrrolocytidine. Photophysical studies were performed to determine possible FRET pairs to be used as molecular beacons and Stern-Volmer …
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Dearomative hydroboration-enabled synthesis of idarubicinone and synthesis of minor cannabinoids and their metabolites
… explored, all known approaches are based on annulations, relying on the union of properly pre-functionalized building blocks. To complement these studies, here we showcase an alternative, non-annulative entry to anthracyclines, starting from a polynuclear arene. Specifically, tetracene was …
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Synthesis and utility of electronically diverse polycyclic aromatics
… cationic intermediates that participate in annulations with adjacent arenes or amides to yield dibenzanthracenes or dioxanthracenes, respectively. In the latter case (Chapter Two), smaller model compounds confirmed this unique reactivity and helped to establish synthetic routes that yield …