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Palladium-catalyzed difunctionalizat...

McCammant, Matthew Scott.

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Palladium-catalyzed difunctionalization reactions of 1,3-dienes and terminal alkenes via pi-allyl stabilized intermediates.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Palladium-catalyzed difunctionalization reactions of 1,3-dienes and terminal alkenes via pi-allyl stabilized intermediates./
作者:	McCammant, Matthew Scott.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	203 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.
Contained By:	Dissertation Abstracts International77-10B(E).
標題:	Analytical chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10118943
ISBN:	9781339802602

Palladium-catalyzed difunctionalization reactions of 1,3-dienes and terminal alkenes via pi-allyl stabilized intermediates.
McCammant, Matthew Scott.

Palladium-catalyzed difunctionalization reactions of 1,3-dienes and terminal alkenes via pi-allyl stabilized intermediates. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 203 p.

Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.

Thesis (Ph.D.)--The University of Utah, 2016.

Palladium-catalyzed alkene difunctionalization reactions represent a powerful methodology for the construction of diverse carbon--carbon and carbon--heteroatom bonds. The success of these transformations requires the effective stabilization of alkyl--Pd intermediates generated following migratory insertion of an alkene. Stabilization of Pd-intermediates helps to prevent side reactions, thus enabling the formation of desired difunctionalization products in high selectivity. Chapter 1 examines distinctive methods used for the interception of alkyl--Pd intermediates and the strategies associated with minimizing byproduct formation.

ISBN: 9781339802602Subjects--Topical Terms:

3168300
Analytical chemistry.

Palladium-catalyzed difunctionalization reactions of 1,3-dienes and terminal alkenes via pi-allyl stabilized intermediates.
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245 1 0 $a Palladium-catalyzed difunctionalization reactions of 1,3-dienes and terminal alkenes via pi-allyl stabilized intermediates.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 203 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.
500 $a Includes supplementary digital materials.
500 $a Adviser: Matthew S. Sigman.
502 $a Thesis (Ph.D.)--The University of Utah, 2016.
520 $a Palladium-catalyzed alkene difunctionalization reactions represent a powerful methodology for the construction of diverse carbon--carbon and carbon--heteroatom bonds. The success of these transformations requires the effective stabilization of alkyl--Pd intermediates generated following migratory insertion of an alkene. Stabilization of Pd-intermediates helps to prevent side reactions, thus enabling the formation of desired difunctionalization products in high selectivity. Chapter 1 examines distinctive methods used for the interception of alkyl--Pd intermediates and the strategies associated with minimizing byproduct formation.
520 $a The Sigman laboratory has been interested in alkene difunctionalization reactions that take advantage of the unique reactivity of pi-allyl/benzyl stabilized intermediates in order to generate significant molecular complexity from simple starting materials. Chapter 2 details the development of the Pd-catalyzed 1,4-difunctionalization of the commodity chemical 1,3-butadiene, which affords difficult to access skipped polyene products. This transformation regioselectively functionalizes the two terminal alkenes of 1,3-butadiene by means of a sigma → pi → sigma isomerization of cationic Pd-intermediates. The utility of the 1,4-difunctionalization of 1,3-butadiene is highlighted by the synthesis of a highly functionalized skipped triene-containing fragment of ripostatin A.
520 $a Chapter 3 describes an advancement of the 1,4-difunctionalization reaction, namely using isoprene as the 1,3-diene substrate to generate skipped diene-containing terpenoid products. This method presents an added challenge resulting from the use of a 1,3-diene with two inequivalent alkenes that can contribute to complex isomeric product mixtures as the result of unselective alkene insertion. Through the use of pyridine-oxazoline-type ligands, good site selectivity of alkene insertion has been achieved. Mechanistic studies that combine design of experiments with systematic multiparameter ligand modulation ultimately suggest that the electronic asymmetry and steric properties of the ligand are critical to the observed enhancement in site selectivity of alkene insertion.
520 $a The development of a 1,3-difunctionalization of terminal alkenes using 1,1-disubstituted vinyl triflates and boronic acids is discussed in Chapter 4. This transformation is realized using a novel difunctionalization strategy, and generates a new C(sp2)--C(sp2) double bond as well as a C(sp3)--C(sp2) bond. Dependent on the boronic acid coupling partner, the reaction affords skipped diene or allylic arene products stereo- and regioselectively.
590 $a School code: 0240.
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650 4 $a Organic chemistry. $3 523952
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