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Solid-Phase Synthesis and Combinatorial Technologies

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9.5 APPLICATIONS TO MOLECULAR RECOGNITION 493

 

O

 

 

blue

HN

 

 

dye

O

 

 

 

O

 

N

 

N

 

 

 

H

O

COOPfp

 

O

9.144a

O2N

red

N

dye

N

 

O

 

N

N

 

 

O

O

COOPfp

9.144b

O OM3

L NH

N M

H 2

HN M1

O

L38

60-member encoded pool library

M1 Gly, L- and D- Val, L- and D-Pro, L- and D-Phe,

 

L- and D-Asn(Trt), L- and D-His (Trt),

 

 

 

 

L- and D-Asp(OtBu), L- and D-Ser(OtBu);

O

 

 

O

 

all N-Fmoc protected.

 

N

 

 

 

 

N

 

 

 

 

H

H

 

M3

PfpOOC

 

 

 

 

 

 

 

H

H

M

NH2

 

 

N

N

 

 

 

 

2

 

O

 

 

O

 

N

 

 

 

 

 

 

 

 

NHBoc

 

 

 

 

M2,1:

RR enantiomer

M

:

RRRR enantiomer

M2,2:

SS enantiomer

3,1

 

 

 

M

:

SSSS enantiomer

 

 

3,2

 

 

 

Figure 9.55 Structure of the SP peptidomimetic encoded pool chiral selector libraryL38 and of the monomer sets M1–M3 used for its synthesis.

494 APPLICATIONS OF SYNTHETIC LIBRARIES

 

N

a-c

N

 

a,b

N

M2,1:

RR enantiomer

 

 

 

 

 

M2,2:

SS enantiomer

 

 

 

 

 

 

 

N3

N3

 

N3

NHBoc

H N

 

NHBoc

 

 

9.145

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

a: Ph3P, toluene, reflux, 1 hr; b: water/THF, reflux, 1 hr; c: Boc2O, DCM, rt, 16 hrs.

 

 

 

 

 

O

 

O

 

 

NH2

d

NH2

e,f

 

NH

HN

 

 

NH2

 

NHBoc

 

NH3+

NH3+

 

 

 

O

 

O

 

 

 

 

 

 

N

N

 

M3,1:

RRRR enantiomer

 

g,h,i

 

H

H

 

M3,2:

SSSS enantiomer

 

PfpOOC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

H

 

d: Boc-on, DMSO, rt, 16 hrs; e: isophthaloyl

 

 

N

N

 

chloride, TEA, DCM, rt, 4 hrs; f: TFA, DCM, rt,

 

 

O

 

O

1 hr; g: bis-Pfp,mono-Me ester of trimesic acid,

 

 

 

 

DIPEA, THF, rt, 16 hrs; h: NaOH, water, MeOH,

THF, rt, 4 hrs; i: PfpOH, EDC, DCM, rt, 16 hrs.

Figure 9.56 Synthesis of the monomer sets M2–M3 used for the synthesis of the SP peptidomimetic encoded pool chiral selector library L38.

elaborated to give four Boc-protected isomeric constructs 9.146a–d (steps a–c, Fig. 9.57). The library L38 was then prepared as shown in Fig. 9.58. Aminomethyl PS resin was acylated with an Fmoc-protected amino acid linker (step a), and after Fmoc deprotection (step b) the resin was divided into four aliquots and treated with four tags, according to a popular encoding method (step c) (177). The portions of encoded resin were then acylated with 9.146a–d to give the four encoded discretes 9.147a–d (step d), and, after pooling, the resin was deprotected, split into 15 aliquots, and tagged (steps e and f). Finally, the encoded intermediates were acylated with M1, pooled, and deprotected (steps g and b, Fig. 9.58) to give the encoded library L38.

The library was screened simply by incubating an excess of 9.144a,b (equimolar amounts of the two colored enantiomers) with a library aliquot in chloroform for 4 h. The library was then washed and dried and finally observed with a microscope to determine the color of each bead. The most selective beads showed either blue

9.5 APPLICATIONS TO MOLECULAR RECOGNITION 495

O

O

N

N

H

H

N

+ PfpOOC

H2N NHBoc

O

a

N

N

H

NHBoc

COOH

O

b,c

O N

N

H

NHBoc

H

H

N

N

O

O

O

O

N

N

H

H

H

H

N

N

O

O

O

O

N

N

H

H

H

H

N

N

O

O

9.146a-d

RR-RRRR RR-SSSS SS-RRRR SS-SSSS

a: TEA, THF, rt, 4 hrs; b: H2, Pearlman catalyst, MeOH, HCl, rt, 26 hrs; c: succinic anhydride, TEA, DMAP, DCM, rt, 16 hrs.

Figure 9.57 Synthesis of the SP peptidomimetic encoded pool chiral selector library L38: preparation of the key intermediates 9.146a–d in solution.

496 APPLICATIONS OF SYNTHETIC LIBRARIES

(L-selective) or red color (D-selective), while beads with low selectivity assumed a brown coloration. Among the selected beads, two enantiomeric structures 9.148a,b (Fig. 9.59) showed a significant enantioselectivity that was confirmed upon resynthesis. Their enantioselectivity was also confirmed with the separation of N-acyl proline racemates lacking the dye moieties, thus highlighting the possible usefulness of 9.148a,b as chiral selectors.

 

L

NH

c

T1

L

NH

a,b

NH2

2

 

2

 

 

 

 

 

 

 

T1

H

 

 

O

O

 

 

 

L

N

 

 

N

N

 

O

 

O

H

H

 

 

 

 

d

O

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

H

H

H

 

 

 

 

N

N

 

 

 

NHBoc

O

O

M3

T2 M2

T1

H

 

 

O

O

L

N

 

 

N

N

 

O

 

O

H

H

 

 

 

 

 

O

 

 

 

 

 

N

 

 

 

 

 

N

 

 

e-g,b

 

 

H

H

H

 

 

 

 

N

N

 

 

 

NH

O

O

 

 

 

O

 

 

 

 

 

NH2

 

 

 

 

 

R

 

 

 

M1

 

 

L38

 

 

 

 

 

60-member

 

encoded pool library

a: N-Fmoc caproic acid, HOBt, DIC, DCM, 2 hrs; b: piperidine, DMF, rt, 30'; c: resin portioning (1 to 4), tagging with T1; d: 9.146a-d, HOBt, EDC, DCM, DMF, rt, 16 hrs; e: pooling, then TFA, DCM, rt, 5'; f:

resin portioning (1 to 15), tagging with T2; g: M1, DIC, DCM, DMF, rt, 2hrs, repeated twice.

Figure 9.58 SP Elaboration of 9.146a–d into the SP peptidomimetic encoded pool chiral selector library L38.

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T2

 

 

 

 

 

T1

H

 

 

O

O

 

L N

 

 

N

N

 

O

 

O

H

H

 

 

 

 

 

O

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

N

 

 

 

 

 

H

H

H

 

 

 

 

N

N

 

 

 

NH

O

O

 

 

 

O

 

 

H2NOCNH2

9.148a

D-Asn-RR-RRRR 81% selection for

9.144a

9.148a other enantiomer L-Asn-SS-SSSS 73% selection for

9.144b

Figure 9.59 Chiral selectors individuated from screening of the SP peptidomimetic encoded pool chiral selector library L38: compounds 9.148a and 9.148b.

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