10006-90-3Relevant academic research and scientific papers
A Cooperative Hydrogen Bond Donor–Br?nsted Acid System for the Enantioselective Synthesis of Tetrahydropyrans
Maskeri, Mark A.,O'Connor, Matthew J.,Jaworski, Ashley A.,Davies, Anna V.,Scheidt, Karl A.
, p. 17225 - 17229 (2018)
Carbocations stabilized by adjacent oxygen atoms are useful reactive intermediates involved in fundamental chemical transformations. These oxocarbenium ions typically lack sufficient electron density to engage established chiral Br?nsted or Lewis acid catalysts, presenting a major challenge to their widespread application in asymmetric catalysis. Leading methods for selectivity operate primarily through electrostatic pairing between the oxocarbenium ion and a chiral counterion. A general approach to new enantioselective transformations of oxocarbenium ions requires novel strategies that address the weak binding capabilities of these intermediates. We demonstrate herein a novel cooperative catalysis system for selective reactions with oxocarbenium ions. This new strategy has been applied to a highly selective and rapid oxa-Pictet–Spengler reaction and highlights a powerful combination of an achiral hydrogen bond donor with a chiral Br?nsted acid.
SUBSTITUTED TETRAHYDROPYRANOINDOLES, DERIVATIVES THEREOF, AND THEIR METHODS OF SYNTHESIS AND USE
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Paragraph 0146-0148; 0175; 0176, (2021/01/25)
Disclosed herein are tetrahydropyranoindole compounds and derivatives thereof, as well as their methods of synthesis and use. The disclosed compounds may be synthesized by methods that utilize a cooperative hydrogen bond donor/Br?nsted acid system. The disclosed compounds may be useful for treating a disease, disorder, or a symptom thereof in a subject in need thereof, such as pain, swelling, and joint stiffness. The disclosed compounds also may be useful for treating cell proliferative diseases and disorders such as cancer.
Studies in the Synthesis of Brevianamides A and B: Pilot Investigations and the Preparation of 1,1-Dimethyl-1,2,4,9-tetrahydrocarbazol-3-one
Ritchie, Robert,Saxton, J. Edwin
, p. 528 - 545 (2007/10/02)
In preliminary investigations directed ultimately at the synthesis of the indoxyl mould metabolites, brevianamides A and B, routes to the synthesis of 4,4-dimethyl-1,3,4,9-tetrahydrocarbazol-2-one and 1,1-dimethyl-1,2,4,9-tetrahydrocarbazol-3-one have bee
INDOLE SYNTHESES UTILIZING o-METHYLPHENYL ISOCYANIDES.
Ito,Kobayashi,Seko,Saegusa
, p. 73 - 84 (2007/10/02)
New indole synthesis starting with o-methylphenyl isocyanides such as o-tolyl, 2,4-xylyl, and 2,6-xylyl isocyanide is described. Treatment of o-tolyl isocyanide with LDA in diglyme at minus 78 degree C generated selectively o-(lithiomethyl)phenyl isocyanide in an almost quantitative yield, which on warming up to room temperature was cyclized to indole after aqueous workup. Similarly, 2,4-xylyl and 2,6-xylyl and 2,6-xylyl isocyanides were cyclized to 5-methylindole and 7-methylindole quantitatively. The o-(lithiomethyl)phenyl isocyanides reacted with electrophiles such as alkyl halides and alkylene oxides to give o-alkylphenyl isocyanides, which were cyclized via the lithiation at the orthobenzylic carbon to afford 3-substituted indoles.
