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多肽合成中困难序列的缩合研究进展(4)

发布时间:2021-06-08   来源:未知    
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非常详细的综述性文章

114

药学学报Acta

PharmaceuticaSinica

2007,42(2):111—117

m。◆面O-…-,'-N

r∞还。凸N'M"几“

8。

~?。彳七峨卓名HBTU-M_/DIP。E:

Pipridine/DMF/H202.TFAcleavage

R=p-OCH3(Hmb),m-N02(2.5-Hnb)oro-N02洲nb)

Figure4

ProposedreactionmechanismfortheacylationreactionwiththeHnbN—auxiliary

depsipeptideisrearrangedyieldingthedesiredpeptidebymildbaseaftercleavagefromtheresin[19,2….4

Sequence-assistedpeptideThe

attachment

of

spacer

noticeable“difficuhsequences”thesynthesis

ofH一

(Thr—Val);一OHandH.Val—Ash—Val.Asn.Val—G1n—Val一

Gin—Val—Asp—OH,theAcytCarrierProtein(65—74)

the

andthehumaninsulinB—chainhavebeeninvestigated.Inall

cases

synthesis(SAPS)

units

to

increase

distancefromthepeptide,cantion,known

also

resin

beforesynthesis

ofthe

target

introductionof

pre—sequencegivesrise

to

reducethe

peptide—chainaggrega—

satisfactoryresults.Inthe

sequence

lattercase.thelysinepre-

to

as“sequence—assistedpeptide

synthesis

couldbeinsulin

cleavedenzymatically

NIR—FT

give

the

(SAPS)”.During

using

studyofsuch“difficultsequences”

strategy,DueLarsenB

aggregation

may

E21。

desB30

B—chain.

rnear—infr ared

theFmoc—protection

that

Fourier—transform)Ramananalysisduringthesvnthesl‘s

of

hasobserved

peptide—chain

when

be

the(Ala)。,the

conformationshiftsofthegrowing

pre—sequencefromcoll

was

significantly

sequences

reduced

are

certain

aminoacid

peptidechain

with[Lys(Boc)]6

incorporatedC—terminally.Thus,

卢一structure(n≥6)to

that

SPPS

randomobserved.

synthesisofthedifficult

poly—alanine,(Ala)n,(n≤with[Lys(Boc)]。(m≤6)

Thisresultisinagreementwiththegeneralobservation

proceeds

optimally

under

random

coil

20)hasbeeninvestigated

and[Glu(tBu)]。。(m≥6)aspre—sequences.With

m/>3,peptidesproductswhileand

are

conditions.5

TheeffectofmixedsolventIt

peptide

iS

not

new

obtained

as

single,homogeneousofdeletionpeptidespeptides

is

complexmixtureFmoc—protected

using

mixed

solventto

improve

to

pay

corresponding

formed

pre—

solubility㈦2“.However.it

use

remainsfor

(n≥6)withoutthe

pre—sequence.A

mixed

greatattentiontohydrogen

bond

of

mixedsolventaggregationdestroying

peptide

sequence,[Lys(Boc)Glu(tBu)]3,has

favorableeffect

on

similarother

andthe

between

the

results.Some

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