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Advancing New Conceptual Frameworks for the Synthesis of Organic Molecules
Advancing New Conceptual Frameworks for the Synthesis of Organic Molecules
Advancing New Conceptual Frameworks for the Synthesis of Organic Molecules

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자료유형  
 학위논문 서양
최종처리일시  
20260202104846
ISBN  
9798293892921
DDC  
547
저자명  
Amber, Charis.
서명/저자  
Advancing New Conceptual Frameworks for the Synthesis of Organic Molecules
발행사항  
[Sl] : University of California, Berkeley, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
687 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: Sarpong, Richmond.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2025.
초록/해제  
요약The following dissertation discusses the development and application of new conceptual frameworks for the synthesis of complex organic molecules. The focus of this work is divided into three conceptually related, but synthetically distinct categories within the fields of synthetic methodological development and the total synthesis of natural products.Chapter 1 describes the development of a C-C cleavage/cross-coupling approach for the synthesis of macrocyclic compounds. Important physical-organic insights were gleaned through computational chemistry using Density Functional Theory (DFT), elucidating a clear trend between the ring size of the product and the efficiency of the reaction, and establishing that the kinetic and thermodynamic challenges associated with macrocyclization reactions can be addressed through strain-release and transition metal-mediated reaction templating. The method developed was applied to the synthesis of a number of Resorcylic Acid Lactone (RAL) natural products.Chapter 2 describes the development of a traceless reactive handle strategy for the single atom skeletal editing of saturated cyclic amines through constitutional isomerization, thus avoiding vestigial functional groups in the desired product. Notably, by using known methods for amine N-oxidation to generate isolable hydroxylamine intermediates, these hydroxylamine functional groups serve to facilitate a reductive rearrangement reaction catalyzed by tris(pentafluorophenyl)borane using a silane terminal reductant, converting piperidines to pyrrolidines. The mechanism of the reaction was investigated with in-depth DFT calculations of the potential energy surface (PES), and the method was applied to the constitutional isomerization of FDA-approved drugs, such as dextromethorphan and PaxilTM.Chapter 3 describes the development of a reductive amination reaction which reductively aminates the C-C bond attached to ketones and aldehydes. By extending this concept of traceless reactive handles, we showed that known C-H oxidation technologies could be leveraged to install ketones and aldehydes, which facilitate the C-C amination process, along with concomitant reduction of the carbonyl functionality. In this way, our developed method enables the formal insertion of a single nitrogen atom into C-C bonds of hydrocarbon feedstocks without a reliance on strain. Among a vast array of applications, this method was applied to the late-stage C-C amination of complex frameworks, enabling rapid access to otherwise-difficult-to-access scaffolds, including an aza-steroid and aza-cannabanoid.Chapter 4 describes the concise synthesis of the complex sesquiterpenoid alkaloid natural product, hispidospermidin, using an "Inside-Out" strategy. In contrast to the three previous landmark syntheses, all of which employ mid-to-late construction if the maximally bridged ring, our work constructs the bicyclo[3.1.1]nonane core in the very first step of the synthesis. Other key steps include the development of a Giese conjugate addition of a bridgehead radical to methylacrylate to forge the quaternary center of the natural product; a phosphine-mediated isomerization reaction was discovered which enabled the construction of the challenging trans-hydrindane moiety of the natural product; lastly, a desaturation was employed to enable the construction of the tetrahydrofuran at a late stage. Analysis of the complexity landscape of each of the four syntheses reveals a correlation between the step of the synthesis in which the primary complexity element is synthesized and the overall step count, i.e., an earlier bicycle construction is associated with a more efficient route.
일반주제명  
Organic chemistry
일반주제명  
Chemistry
일반주제명  
Analytical chemistry
키워드  
Density Functional Theory
키워드  
Resorcylic Acid Lactone
키워드  
N-oxidation
기타저자  
University of California, Berkeley Chemistry
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aAmber,  Charis.
■24510▼aAdvancing  New  Conceptual  Frameworks  for  the  Synthesis  of  Organic  Molecules
■260    ▼a[Sl]▼bUniversity  of  California,  Berkeley▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a687  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Sarpong,  Richmond.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Berkeley,  2025.
■520    ▼aThe  following  dissertation  discusses  the  development  and  application  of  new  conceptual  frameworks  for  the  synthesis  of  complex  organic  molecules.  The  focus  of  this  work  is  divided  into  three  conceptually  related,  but  synthetically  distinct  categories  within  the  fields  of  synthetic  methodological  development  and  the  total  synthesis  of  natural  products.Chapter  1  describes  the  development  of  a  C-C  cleavage/cross-coupling  approach  for  the  synthesis  of  macrocyclic  compounds.  Important  physical-organic  insights  were  gleaned  through  computational  chemistry  using  Density  Functional  Theory  (DFT),  elucidating  a  clear  trend  between  the  ring  size  of  the  product  and  the  efficiency  of  the  reaction,  and  establishing  that  the  kinetic  and  thermodynamic  challenges  associated  with  macrocyclization  reactions  can  be  addressed  through  strain-release  and  transition  metal-mediated  reaction  templating.  The  method  developed  was  applied  to  the  synthesis  of  a  number  of  Resorcylic  Acid  Lactone  (RAL)  natural  products.Chapter  2  describes  the  development  of  a  traceless  reactive  handle  strategy  for  the  single  atom  skeletal  editing  of  saturated  cyclic  amines  through  constitutional  isomerization,  thus  avoiding  vestigial  functional  groups  in  the  desired  product.  Notably,  by  using  known  methods  for  amine  N-oxidation  to  generate  isolable  hydroxylamine  intermediates,  these  hydroxylamine  functional  groups  serve  to  facilitate  a  reductive  rearrangement  reaction  catalyzed  by  tris(pentafluorophenyl)borane  using  a  silane  terminal  reductant,  converting  piperidines  to  pyrrolidines.  The  mechanism  of  the  reaction  was  investigated  with  in-depth  DFT  calculations  of  the  potential  energy  surface  (PES),  and  the  method  was  applied  to  the  constitutional  isomerization  of  FDA-approved  drugs,  such  as  dextromethorphan  and  PaxilTM.Chapter  3  describes  the  development  of  a  reductive  amination  reaction  which  reductively  aminates  the  C-C  bond  attached  to  ketones  and  aldehydes.  By  extending  this  concept  of  traceless  reactive  handles,  we  showed  that  known  C-H  oxidation  technologies  could  be  leveraged  to  install  ketones  and  aldehydes,  which  facilitate  the  C-C  amination  process,  along  with  concomitant  reduction  of  the  carbonyl  functionality.  In  this  way,  our  developed  method  enables  the  formal  insertion  of  a  single  nitrogen  atom  into  C-C  bonds  of  hydrocarbon  feedstocks  without  a  reliance  on  strain.  Among  a  vast  array  of  applications,  this  method  was  applied  to  the  late-stage  C-C  amination  of  complex  frameworks,  enabling  rapid  access  to  otherwise-difficult-to-access  scaffolds,  including  an  aza-steroid  and  aza-cannabanoid.Chapter  4  describes  the  concise  synthesis  of  the  complex  sesquiterpenoid  alkaloid  natural  product,  hispidospermidin,  using  an  "Inside-Out"  strategy.  In  contrast  to  the  three  previous  landmark  syntheses,  all  of  which  employ  mid-to-late  construction  if  the  maximally  bridged  ring,  our  work  constructs  the  bicyclo[3.1.1]nonane  core  in  the  very  first  step  of  the  synthesis.  Other  key  steps  include  the  development  of  a  Giese  conjugate  addition  of  a  bridgehead  radical  to  methylacrylate  to  forge  the  quaternary  center  of  the  natural  product;  a  phosphine-mediated  isomerization  reaction  was  discovered  which  enabled  the  construction  of  the  challenging  trans-hydrindane  moiety  of  the  natural  product;  lastly,  a  desaturation  was  employed  to  enable  the  construction  of  the  tetrahydrofuran  at  a  late  stage.  Analysis  of  the  complexity  landscape  of  each  of  the  four  syntheses  reveals  a  correlation  between  the  step  of  the  synthesis  in  which  the  primary  complexity  element  is  synthesized  and  the  overall  step  count,  i.e.,  an  earlier  bicycle  construction  is  associated  with  a  more  efficient  route.
■590    ▼aSchool  code:  0028.
■650  4▼aOrganic  chemistry
■650  4▼aChemistry
■650  4▼aAnalytical  chemistry
■653    ▼aDensity  Functional  Theory
■653    ▼aResorcylic  Acid  Lactone
■653    ▼aN-oxidation
■690    ▼a0490
■690    ▼a0486
■690    ▼a0485
■71020▼aUniversity  of  California,  Berkeley▼bChemistry.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0028
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359184▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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