Chemo-, regio-, and diastereoselective C-C and C-O bond formation via transition metal catalysis / Nusrah Hussain.

Format:

Book

Manuscript

Thesis/Dissertation

Author/Creator:

Hussain, Nusrah, author.

Contributor:

Walsh, Patrick J., degree supervisor.

Dailey, William P., degree committee member.

Joullié, Madeleine M., degree committee member.

Kozlowski, Marisa C., 1967- degree committee member.

University of Pennsylvania. Department of Chemistry, degree granting institution.

Language:

English

Subjects (All):

Penn dissertations--Chemistry.

Chemistry--Penn dissertations.

Local Subjects:

Penn dissertations--Chemistry.

Chemistry--Penn dissertations.

Physical Description:

xiv, 298 leaves : illustrations ; 29 cm

Production:

[Philadelphia, Pennsylvania] : University of Pennsylvania, 2015.

Summary:

The efficient stereoselective formation of C-C and C-O bonds remains a critical challenge in organic chemistry. The level difficulty of these bond formations increases dramatically when regio-, diastereo-, and chemoselectivity issues are present. In efforts to address such challenges, this thesis summarizes three successful strategies to develop highly stereoselective C-C and C-O bond formation reactions: 1) the first strategy outlines the direct metallation and subsequent chemo- and regioselective cross-coupling of benzylic sp3-hybridized C-H bonds (pKa values >34) to form C- bonds via palladium catalyzed deprotonative cross-coupling process (DCCP), 2) the second strategy outlines the application of 1,1-heterobimetallic borozinc reagents in the diastereoselective C- bond-forming reactions, and 3) the third strategy outlines the use of transition metal-catalysis in the highly chemo- and diastereoselective C-O bond formation via vanadium catalyzed directed epoxidation. Chapters 1 and 2 summarize a program that we have recently initiated in our laboratory known as deprotonative cross-coupling process (DCCP). DCCP is the reversible in situ deprotonation of weakly acidic sp3-hybridized C-H bonds under mild conditions, which are then catalytically cross-coupled with aryl electrophiles under palladium catalysis. Chapters 3 and 4 summarize the potential usefulness of 1-alkenyl-l,l-heterobimetallics in the stereoselective C-C bond formations in organic synthesis. Our group reported a practical generation of 1,1-heterobimetallics from air-stable B(pin)-substituted alkynylboronate esters and demonstrated their utility in a variety of one-pot transformations to provide boron-substituted allylic alcohols, dienols, [alpha]-hydroxy ketones, and [alpha]-dihydroxy ketones with high diastereoselectivity. More applications of these reagents are also explored in Chapters 3 and 4.

Notes:

Ph. D. University of Pennsylvania 2015.

Department: Chemistry.

Supervisor: Patrick J. Walsh.

Includes bibliographical references.

OCLC:

952211923