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Enantioselective Synthesis of Stereogenic-At-Phosphorus(V) Compounds via Hydrogen-Bond-Donor Catalysis- [electronic resource]
Enantioselective Synthesis of Stereogenic-At-Phosphorus(V) Compounds via Hydrogen-Bond-Don...
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Enantioselective Synthesis of Stereogenic-At-Phosphorus(V) Compounds via Hydrogen-Bond-Donor Catalysis- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214100112
ISBN  
9798379613563
DDC  
547
저자명  
Forbes, Katherine Carmen.
서명/저자  
Enantioselective Synthesis of Stereogenic-At-Phosphorus(V) Compounds via Hydrogen-Bond-Donor Catalysis - [electronic resource]
발행사항  
[S.l.]: : Harvard University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(164 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
주기사항  
Advisor: Jacobsen, Eric N.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약In Chapter 1, we review organocatalytic approaches for the enantioselective synthesis of stereogenic-at-P(V) compounds. General organocatalytic activation modes used for constructing P(V) stereocenters are discussed, including covalent catalysis, hydrogen-bond-donor catalysis, and general base catalysis. Existing synthetic methods applying these modalities for the enantioselective synthesis of stereogenic-at-P(V) compounds are reviewed, and the proposed mechanisms for these reactions are discussed. In Chapter 2, we report the development of a hydrogen-bond-donor catalyzed desymmetrization of phosphonic dichlorides with amines to enantioselectively furnish chlorophosphonamidate building blocks using a commercially available catalyst. We demonstrate that chlorophosphonamidates possess two leaving groups which can be displaced sequentially and stereospecifically. Furthermore, we explore the use of chlorophosphonamidates as bifunctional stereogenic-at-P(V) building blocks which can serve as synthetic precursors to access a diverse array of stereogenic-at-P(V) targets. The synthetic utility of this methodology is established through its application to the synthesis of bioactive P-stereogenic targets. In Chapter 3, we detail the development of a hydrogen-bond-donor catalyzed desymmetrization of phosphinic acids via an enantioselective alkylation reaction with sulfonium reagents to generate chiral phosphinate esters. Evaluation of different sulfonium reagents revealed a significant effect of the sulfonium structure on enantioselectivity, with a thianthrene-derived sulfonium reagent yielding the phosphinate products with the highest levels of enantioenrichment. Moderate levels of enantioselectivity are observed with sterically hindered and unhindered phosphinic acids. 
일반주제명  
Organic chemistry.
일반주제명  
Physical chemistry.
일반주제명  
Molecular chemistry.
키워드  
Catalysis
키워드  
Enantioselective synthesis
키워드  
Phosphorus
키워드  
P-stereogenic targets
키워드  
Chlorophosphonamidates
기타저자  
Harvard University Chemistry and Chemical Biology
기본자료저록  
Dissertations Abstracts International. 84-12B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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