Agents de dédoublement. 3. Ethers benzyliques du (R)-(−) et du (S)-(+)-2-aminobutan-1-ol, et leur utilisation dans le dédoublement de dérivés N-acylés de la phénylglycine et de la p-hydroxyphénylglycine
作者:Joël Touet、Laurent Faveriel、Eric Brown
DOI:10.1016/0040-4020(94)01037-z
日期:1995.2
Treatment of the readily available (S)-(+) and (R)-(-) enantiomers of 2-aminobutan-1-ol 1 with sodium hydride followed by benzyl chloride, or a substituted benzyl halide, afforded the corresponding O-benzyl bases 4-7 ill good yields. These new bases are recommended for the large scale resolution of racemic acids. For instance, they proved efficient for the practical resolutions of alpha-methylsuccinic acid (+/-)-9, N-acetylphenylglycine (+/-)-11, N-acetyl-(4-hydroxyphenyl) glycine (+/-)-14 and N-chloroacetyl-(4-hydroxyphenyl) glycine (+/-)-15.
Enzymes in organic synthesis: use of subtilisin and a highly stable mutant derived from multiple site-specific mutations
作者:Chi Huey Wong、S. T. Chen、William J. Hennen、Jeffrey A. Bibbs、Y. F. Wang、Jennifer L. C. Liu、Michael W. Pantoliano、Marc Whitlow、Philip N. Bryan
DOI:10.1021/ja00159a006
日期:1990.1
wild-type enzyme to organic synthesis has been demonstrated in the regioselective acylation of nucleosides in anhydrous dimethylformamide (with 65-100% regioselectivity at the 5'-position), in the enantioselective hydrolysis of N-protected and unprotected common and uncommon amino acid esters inmore » water (with 85-98% enantioselectivity for the L-isomer), and in the synthesis of di- and oligopeptides