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ECONOMIES
OF
ORGANIC SYNTHESIS
Manoj Kumar Sahoo
INTROduCTIO
N
 CHEMICAL GENOME
CHEMIST IN MOLECULAR REVOLUTION
 INTERPRETING CHEMICAL GENOME
 LESSONS FROM NATURAL PRODUCTS
 REVERSE MOLECULAR ENGINEERING
 STRUCTURE, FUNCTION, DESIGN & SYNTHESIS
HISTORY OF ORGANIC SYNTHESIS
PENICILLIN
(1957)
OXAZOLONE β LACTAM
PALYTOXIN
128 carbon atoms
64 Stereocentres
7 Geometrical
HENdRICSON’S CONCEPT
“ The ideal synthesis creates a complex skeleton…. in a
sequence of successive construction reactions involving no
intermediate refunctionalizations and leading directly the
structure of the target not only it’s skeleton but also its
correctely placed functionality”
J. Am. Chem Soc.,1975, 97, 5784
STEP ECONOMY
Nature, 460, 2009, 197
GuIdELINES
A. SINGLE OPERATION, MULTISTEPPROCESS
(Cascade, tandem, domino, chain, regenerative)
 Pericyclic,
 electroPlilic,
 NucleoPhilic,
 radical,
 Metal based
N
U
C
L
E
O
P
H
I
L
L
I
C
B. DESIGN & DISCOVERY OF NEW
REACTIONS WITHHIGHTRC
TRC: TARGETRRELEVANT COMPLEXITY
TAXOL
ANTICANCERANTIRETROVIRAL
PROSTRATI
N
MLn
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8 9 10 11
NO OF STEPS
COMPLEXITY
C. PROTECTIVE GROUPFREE
Masks one functional group
Solves selectivity problems
X Y Y
X Z Z
PG
PG
GuideliNes
1. In situ protection & deprotection
O
O
PG
O
PG
HO
MgBr
O
HO
O
O
LiHMDS
OLi
O
MgBr
OLi
HO
O
HO
2. Biogenesis oriented synthesis
3. TM catalysed skeleton formation
4. Order of introduction of functional group
• Target-oriented
• Protecting groups
(PG) needed
• Reactivity is ‘caged’
• Target-oriented
• No protecting groups
• No enzymes
• Natural reactivity of
functional groups is
used constructively
• Function-oriented
• No protecting groups
• Enzymes needed to
promote/control reactivity
AMBIGUINE
Nature, 2007, 446, 404-408
D. FUNCION ORIENTEDSYNTHESIS (FOS)
Nature, 460, 2009, 197
PHORBOL ESTER DESIGNED
MAINTAINS ACTIVITY
PHORBOL ESTERS
(AcTivE TumOR PROmOTER)
>70 STEPS, 1.4 nM 29 STEPS, 0.3 nM
BRYOSTATiN
(REvERSE muLTidRug RESiSTANcE, ANTicANcER, mEmORY ENHANcER (ALzHEimER))
NATURE SUPPLY: 0.00014%
FOS : STABLE ANALOguE dESigN
(LAuLimidE)
ANTICANCER(TAXOL RESISTANT)
J. Org. Chem. 1988, 53, 3642–3644.
NATURE SUPPLY: 0.00016%
CONTRIBUTION FROMDRDE
N
OH
NH
O
NH
S
PSCl3/Et3N/H2O
Chem. Commun., 2009, 5409–5411
REdOX
EcONOmY
Angew. Chem. Int. Ed. 2009, 48, 2854 – 2867
Redox economy refers to the endeavours to reduce the
number of nonstrategic (those that do not set
stereochemistry or are not skeleton-building) or
corrective oxidation and reduction steps
redox economy in a synthesis achieved by properchoice of reactions
C
A
S
E
S
T
U
D
Y
LiNEAR iNcREASE/dEcREASE iN OXidATiON
LEvEL
BiOmimETic
APPROAcH
J. Am. Chem. Soc. 1995, 117,11106 – 11112.
1. Pd2(dba)3,
HCO2H
1. NaBH4, CeCl3
1.AD-mix β
NaIO42. NaBH4
3. TIPSCl
3.Bu3SnH
AIBN
HO
2.OSO4, , NaIO4
2.Raney Ni
1.NaBH4
1.HF
2. DMP
3.NaCl02
J. Am. Chem. Soc. 2005, 127, 15712 – 15713.
GUIDELINES
Redox economy should be applied tactically by examining slight
changes in the starting materials.
Choreography must be scrutinized in orderto optimally
introduce functionality and avoid chemo-unselective reactions
Whetherreagents exist that could make the redox step
unnecessary.
The most drastic maximization of redox economy( most difficult)
can occurthrough examining connectivity and choosing
challenging retrosynthetic disconnections
ATOM ECONOMY
Nature, 1991, 254, 1471-1477
 HOw MUCH Of rEACTANTS END Up IN THE prODUCT?
 MASS EffICIENCY
 BENEfITS : EffECTIvE USE Of rAw MATErIALS
DECrEASED EMISSIONS & wASTE DISpOSAL
 HIGHEST DEGrEE Of ATOM ECONOMY:
COMBINE TwO Or MOrE BUILDING BLOCkS wITH ANY
OTHEr rEACTANT/rEAGENT NEEDED CATALYTICALLY
CYCLOADDITION/ELECTrOCYCLIC
rEACTIONS
 100% Atom Economic
 Stereochemistry
 Only aromatic Transition State
(4n+2) electron
 Fails for Unactivated Dienes
UNCATALYSED
TM CATALYSED
 Co-Oligomerisation
 Regioselectivity (Tethering)
 Both 4n & 4n+2 systems
2+2, 4+2, 4+4, 3+4, 5+3, 5+2, 6+2,
6+4, 2+2+2, 2+2+2+2 etc……
MLn MLn
X
X C Y
N
X
Y
TMS
TMS
O
O
HO
O
H
H H
H
TMS
TMS
H
O
O
H
TMS
TMS
OO
Co complex
ESTRON
E
CONCLUSION
 minimizing nonstrategic redox operation & maximizing c-c bond forming
reaction
 Disconnections should be made to maximize convergency
 The overall oxidation level of intermediates should linearly escalate during
assembly of the molecularframework(except in cases where there is
strategic benefit such as an asymmetric reduction)
 cascade (tandem) reactions should be designed and incorporated to elicit
maximum structural change perstep
 The innate reactivity of functional groups should be exploited so as to
reduce the numberof (orperhaps even eliminate) protecting groups
 Effort should be spent on the invention of new methodology to facilitate
the aforementioned criteria and to uncovernew aspects of chemical
reactivity
 If the target molecule is of natural origin, biomimetic pathways (either
known orproposed) should be incorporated
prOf SHEEHAN prOf COrEY prOf NICHOLAU prOf BArAN
prOf TrOST prOf wENDEr prOf HOffMAN prOf HENDrICkSON
THANkS
Economies of  synthesis

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Economies of synthesis

  • 2.
  • 3. INTROduCTIO N  CHEMICAL GENOME CHEMIST IN MOLECULAR REVOLUTION  INTERPRETING CHEMICAL GENOME  LESSONS FROM NATURAL PRODUCTS  REVERSE MOLECULAR ENGINEERING  STRUCTURE, FUNCTION, DESIGN & SYNTHESIS
  • 4.
  • 5. HISTORY OF ORGANIC SYNTHESIS
  • 7. PALYTOXIN 128 carbon atoms 64 Stereocentres 7 Geometrical
  • 8. HENdRICSON’S CONCEPT “ The ideal synthesis creates a complex skeleton…. in a sequence of successive construction reactions involving no intermediate refunctionalizations and leading directly the structure of the target not only it’s skeleton but also its correctely placed functionality” J. Am. Chem Soc.,1975, 97, 5784
  • 10. GuIdELINES A. SINGLE OPERATION, MULTISTEPPROCESS (Cascade, tandem, domino, chain, regenerative)
  • 11.  Pericyclic,  electroPlilic,  NucleoPhilic,  radical,  Metal based
  • 13.
  • 14. B. DESIGN & DISCOVERY OF NEW REACTIONS WITHHIGHTRC TRC: TARGETRRELEVANT COMPLEXITY TAXOL ANTICANCERANTIRETROVIRAL PROSTRATI N MLn
  • 15. 0 10 20 30 40 50 60 1 2 3 4 5 6 7 8 9 10 11 NO OF STEPS COMPLEXITY
  • 16. C. PROTECTIVE GROUPFREE Masks one functional group Solves selectivity problems X Y Y X Z Z PG PG
  • 17. GuideliNes 1. In situ protection & deprotection O O PG O PG HO MgBr O HO O O LiHMDS OLi O MgBr OLi HO O HO 2. Biogenesis oriented synthesis 3. TM catalysed skeleton formation 4. Order of introduction of functional group
  • 18. • Target-oriented • Protecting groups (PG) needed • Reactivity is ‘caged’ • Target-oriented • No protecting groups • No enzymes • Natural reactivity of functional groups is used constructively • Function-oriented • No protecting groups • Enzymes needed to promote/control reactivity AMBIGUINE
  • 20. D. FUNCION ORIENTEDSYNTHESIS (FOS) Nature, 460, 2009, 197
  • 21. PHORBOL ESTER DESIGNED MAINTAINS ACTIVITY PHORBOL ESTERS (AcTivE TumOR PROmOTER)
  • 22. >70 STEPS, 1.4 nM 29 STEPS, 0.3 nM BRYOSTATiN (REvERSE muLTidRug RESiSTANcE, ANTicANcER, mEmORY ENHANcER (ALzHEimER)) NATURE SUPPLY: 0.00014%
  • 23. FOS : STABLE ANALOguE dESigN (LAuLimidE) ANTICANCER(TAXOL RESISTANT) J. Org. Chem. 1988, 53, 3642–3644. NATURE SUPPLY: 0.00016%
  • 24.
  • 26. REdOX EcONOmY Angew. Chem. Int. Ed. 2009, 48, 2854 – 2867 Redox economy refers to the endeavours to reduce the number of nonstrategic (those that do not set stereochemistry or are not skeleton-building) or corrective oxidation and reduction steps
  • 27. redox economy in a synthesis achieved by properchoice of reactions C A S E S T U D Y
  • 28.
  • 29.
  • 30. LiNEAR iNcREASE/dEcREASE iN OXidATiON LEvEL BiOmimETic APPROAcH
  • 31. J. Am. Chem. Soc. 1995, 117,11106 – 11112. 1. Pd2(dba)3, HCO2H 1. NaBH4, CeCl3 1.AD-mix β NaIO42. NaBH4 3. TIPSCl 3.Bu3SnH AIBN HO 2.OSO4, , NaIO4 2.Raney Ni 1.NaBH4 1.HF 2. DMP 3.NaCl02
  • 32. J. Am. Chem. Soc. 2005, 127, 15712 – 15713.
  • 33. GUIDELINES Redox economy should be applied tactically by examining slight changes in the starting materials. Choreography must be scrutinized in orderto optimally introduce functionality and avoid chemo-unselective reactions Whetherreagents exist that could make the redox step unnecessary. The most drastic maximization of redox economy( most difficult) can occurthrough examining connectivity and choosing challenging retrosynthetic disconnections
  • 34. ATOM ECONOMY Nature, 1991, 254, 1471-1477  HOw MUCH Of rEACTANTS END Up IN THE prODUCT?  MASS EffICIENCY  BENEfITS : EffECTIvE USE Of rAw MATErIALS DECrEASED EMISSIONS & wASTE DISpOSAL  HIGHEST DEGrEE Of ATOM ECONOMY: COMBINE TwO Or MOrE BUILDING BLOCkS wITH ANY OTHEr rEACTANT/rEAGENT NEEDED CATALYTICALLY
  • 35. CYCLOADDITION/ELECTrOCYCLIC rEACTIONS  100% Atom Economic  Stereochemistry  Only aromatic Transition State (4n+2) electron  Fails for Unactivated Dienes UNCATALYSED TM CATALYSED  Co-Oligomerisation  Regioselectivity (Tethering)  Both 4n & 4n+2 systems 2+2, 4+2, 4+4, 3+4, 5+3, 5+2, 6+2, 6+4, 2+2+2, 2+2+2+2 etc…… MLn MLn X X C Y N X Y
  • 37. CONCLUSION  minimizing nonstrategic redox operation & maximizing c-c bond forming reaction  Disconnections should be made to maximize convergency  The overall oxidation level of intermediates should linearly escalate during assembly of the molecularframework(except in cases where there is strategic benefit such as an asymmetric reduction)  cascade (tandem) reactions should be designed and incorporated to elicit maximum structural change perstep  The innate reactivity of functional groups should be exploited so as to reduce the numberof (orperhaps even eliminate) protecting groups  Effort should be spent on the invention of new methodology to facilitate the aforementioned criteria and to uncovernew aspects of chemical reactivity  If the target molecule is of natural origin, biomimetic pathways (either known orproposed) should be incorporated
  • 38. prOf SHEEHAN prOf COrEY prOf NICHOLAU prOf BArAN prOf TrOST prOf wENDEr prOf HOffMAN prOf HENDrICkSON