deprotection वाक्य
उदाहरण वाक्य
मोबाइल
- This classical approach typically requires multiple protection / deprotection steps in addition to the key anomeric activation / coupling reaction which, depending upon the glycosyl donor / acceptor pair, can lead to a mixture of anomers.
- Unlike classical chemical glycosylation, glycorandomization methods are divergent ( " i . e . ", diverge from a common starting material, see divergent synthesis ) and are not dependent upon sugar / aglycon protection / deprotection or sugar anomeric activation.
- Cyclobutanone can also be prepared in a two step procedure by dialkylation of 1, 3-dithiane with 1-bromo-3-chloropropane followed by deprotection to the ketone with mercuric chloride ( HgCl 2 ) and cadmium carbonate ( CdCO 3 ).
- A selective deprotection will likely be successful if there is a substantial difference in sterics ( e . g ., primary TBS vs . secondary TBS or primary TES vs primary TBS ) or electronics ( e . g . primary TBDPS vs . primary TBS ).
- For example, if each coupling step were to have 99 % yield, a 26-amino acid peptide would be synthesized in 77 % final yield ( assuming 100 % yield in each deprotection ); if each step were 95 %, it would be synthesized in 25 % yield.
- The resulting final product is a TFA salt, which is more difficult to solubilize than the fluoride salts generated in Boc SPPS . This method is thus milder than the Boc method because the deprotection / cleavage-from-resin steps occur with different conditions rather than with different reaction rates.
- Because N-terminal deprotection occurs repeatedly during peptide synthesis, protecting schemes are established such that different types of side chain protecting groups ( e . g ., Bzl, tBu, etc . ) are matched to either Boc or Fmoc, respectively, for ultimate deprotection that is optimized.
- Because N-terminal deprotection occurs repeatedly during peptide synthesis, protecting schemes are established such that different types of side chain protecting groups ( e . g ., Bzl, tBu, etc . ) are matched to either Boc or Fmoc, respectively, for ultimate deprotection that is optimized.
- While traditional synthetic methods accomplish the synthesis of hexoses using variations of iterative protection-deprotection strategies, requiring 8 14 steps, organocatalysis can access many of the same substrates using an efficient two-step protocol involving the proline-catalyzed dimerization of alpha-oxyaldehydes followed by tandem Mukaiyama aldol cyclization.
- If a compound containing more than two kinds of building blocks is synthesized, a step is added before the deprotection of the building block bound to the bead; a functional group which is on the bead and did not react with an added building block has to be protected by another protecting group which is not removed at the deprotective condition of the building block.
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