A new method for the synthesis of peptides using the adducts of phosphorus compounds and tetrahalomethanes
โ Scribed by Shun-ichi Yamada; Yoshio Takeuchi
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- French
- Weight
- 193 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
It has been known that the carboxylic acids are converted to the corresponding acid halides by treatment with the aaduct of triphenylphosphine and carbon tetrachloride 1) or bromine. 2) Recently, Barstow and Hruby reported a simple method for the synthesis of amides using triphenylphosphine and bromotrichloromethane.3) They also briefly tested the possibility of using this method for the synthesis of peptides. However, they neither examined the racemization test under fragment condensation nor synthesized di-or tripeptides except for Z-Phe-Gly-OEt.
Hruby's report prompted us to communicate our results.
We had already investigated a new method for the synthesis of peptides using the adducts of phosphorus compounds (RsP) and tetrahalomethanes (CXI,), and had found reaction
๐ SIMILAR VOLUMES
molar equivalent of SOCl, under prcssure at 150" for 5 to 8 h yields phosphonic dichlorides in quantitative yield. I n addition sulfur and sulfur clichloriclc is formed according to thc cquation : ,RP(S)CI,+ SOClz+ RP(O)CI,+ X I , + S This method is particularly useful for thc preparation of CH,P(0
polarization functions at all atoms Ld (C.P) = 0.8, 0.5; LJH) = 0.65; active space for the MCSCF geometry optimization 3a, plus 3a, orbitals; the multireference calculations were carried out in this space. All MCSCF and MRCl calculations were undertaken with the program system MOL-PRO (201.
of Groups IVb and Vb as tridentate ligands to transition metal carbonyls have hitherto failed. We have now been able to prepare the first representative of this class of compounds, nonaphenylcyclotrisiIaphosphanetricarbonyln~olybdenum(0) ( I ) , by reaction of nonaphenylcyclotrisilaphosphane 131 wit
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