## Abstract The selective tritiation of methyl 10(R/S)‐hydroxy‐11(R),12(S)‐epoxyeicosa‐5,8,14‐triynoate into two C^10^‐epimeric [^3^H~6~]‐hepoxilins B~3~ methyl esters is described. These compounds are subsequently converted into two C^8^‐epimeric [^3^H~6~]‐hepoxilins A~3~ methyl esters by allylic
Synthesis of D:A-friedo-lup-19-ene and its conversion into methyl trinorshionanoate
✍ Scribed by Yasushi Yokoyama; Tokiko Hirao; Takahiko Tsuyuki; Yoshihiko Moriyama; Tatsushi Murae; Takeyoshi Takahashi
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- French
- Weight
- 133 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0040-4039
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Selective ring-opening polymerization and copolymerization of 1,5-anhydro-D-xylofuranose derivatives were studied. Stereoregular (1----5)-alpha-D-xylofuranan was synthesized from a new monomer, 1,5-anhydro-2,3-di-O-(tert-butyldimethylsilyl)-beta-D-xylofuranose , with phosphorus pentafluoride and ant
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## Abstract A new tripeptide (dimer), bis[(L‐cysteine‐__S__‐acetyl)‐L‐hemicystinyl(__S__^2^ → __S__^2^)‐D‐valine] (**6**) was synthesized by coupling __N__‐(__tert__‐butoxycarbonyl)‐__S__‐carboxymethyl‐L‐cysteine benzyl ester (**1**) with __S__‐trityl‐L‐cysteinyl‐D‐valine benzyl ester and subsequen