An Efficient Strategy to Orthogonally Protected (<i>R</i>)- and (<i>S</i>)-α-Methyl(alkyl)serine-Containing Peptides via a Novel Azlactone/Oxazoline Interconversion Reaction
作者:Daniel Obrecht、Michael Altorfer、Christian Lehmann、Peter Schönholzer、Klaus Müller
DOI:10.1021/jo952068g
日期:1996.1.1
for the synthesis of (R)- and (S)-alpha-methyl(alkyl)serine-containing peptides is presented. Using (S)-phenylalanine cyclohexylamide 6 as chiral auxiliary, the optically pure azlactones (R)- and (S)-2 were synthesized via a novel azlactone/oxazoline interconversion reaction (Figures 3 and 6). These azlactones constitute fully protected and activated synthetic equivalents of (R)- and (S)-alpha-methylserine
提出了一种合成(R)-和(S)-α-甲基(烷基)丝氨酸的肽的新策略。使用(S)-苯丙氨酸环己酰胺6作为手性助剂,通过新颖的氮杂内酯/恶唑啉互变反应合成了光学纯的氮杂内酯(R)-和(S)-2(图3和6)。这些a内酯构成(R)-和(S)-α-甲基丝氨酸的完全保护和活化的合成等同物,可以直接掺入肽中,而无需进一步的保护基操纵。像其他的α,α-二烷基甘氨酸一样,光学纯的α-烷基丝氨酸可用于稳定短肽中的β转角和α螺旋构象。