New Methods for Stereoselective Incorporation of Boron into Molecules Utilizing 1,1-Organodiboronate Esters Public Deposited

Analytics

Downloadable Content

Download PDF
Request Accessible Version
Last Modified
  • March 20, 2019
Creator
  • Murray, Stephanie
    • Affiliation: College of Arts and Sciences, Department of Chemistry
Abstract
  • I. Enantio- and Diastereoselective 1,2-Additions of 1,1-Diborylalkanes to alpha-Ketoesters An enantio- and diastereoselective addition of 1,1-diborylalkanes to alpha-ketoesters is reported. The reaction is catalyzed by a copper-phosphoramidite catalyst system and yields products in up to 70% yield, 99:1 er and >20:1 dr after oxidation to the corresponding diol. The utility of the products is illustrated through functionalizations including homologation, cross-metathesis, and tetrahydropyran synthesis. II. Stereoselective 3-Component Bis-Electrophile Couplings of 1,1-Diborylalkanes A stereoselective tandem epoxide ring-opening/allylation reaction facilitated by a copper catalyst is reported. The reaction is tolerant of alkyl and aryl epoxides in good yield (up to 99%) and diastereoselectivity (up to >20:1). The application of this technique to the synthesis of polyol motifs is explored. Cross coupling, amination, and alkene functionalization reactions illustrate the versatility of the products. III. Synthesis of Stereodefined Alkenyl Boronates from Epoxides and Diborylmethane through Pd-Catalyzed Dehydroboration The palladium catalyzed synthesis of alkenyl boronate esters from epoxides and diborylmethane via a dehydroboration process is reported. Products are obtained in up to 75% yield as single olefin isomer. The substrate scope includes alkyl, aryl, and complex steroid derived molecules. The products are further functionalized through cross coupling and cycloproponation procedures.
Date of publication
Keyword
DOI
Resource type
Rights statement
  • In Copyright
Advisor
  • Miller, Alexander
  • Meek, Simon
  • Johnson, Jeffrey
  • Dempsey, Jillian
  • Waters, Marcey
Degree
  • Doctor of Philosophy
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2018
Language
Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
6t053h08c?file=thumbnail Murray_unc_0153D_18012.pdf 2019-04-12 Embargo
Default PREMIS_Events_Metadata_0_c7333a1e-183a-404a-a0c4-9c386e3f2300.txt 2019-04-12 Public
Default original_metadata_file_c7333a1e-183a-404a-a0c4-9c386e3f2300.xml 2019-04-12 Public