S<sub>N</sub>2 Reaction of Sulfur Nucleophiles with Hindered Sulfamidates: Enantioselective Synthesis of α-Methylisocysteine
作者:Alberto Avenoza、Jesús H. Busto、Gonzalo Jiménez-Osés、Jesús M. Peregrina
DOI:10.1021/jo051632c
日期:2006.2.1
valuable starting material, the synthesis of two new α-methylisocysteine derivatives has been carried out to cover the lack of α- and β-methylated amino acids that incorporate the cysteine or isocysteine skeleton. These compounds are two new α,α-disubstituted β-amino acids (β2,2-amino acids), and the synthetic routes involve nucleophilic ring opening followed by acid hydrolysis.
此处描述的工作表明,五元环状α-甲基异丝氨酸衍生的氨基磺酸盐(R)-1表现为极好的手性结构单元,可通过S N 2攻击四级碳上的硫亲核试剂进行开环反应。作为该方法的综合应用,并证明该氨基磺酸盐是有价值的原料,已经进行了两种新的α-甲基异半胱氨酸衍生物的合成,以弥补缺乏掺入半胱氨酸的α-和β-甲基化氨基酸的不足。或异半胱氨酸骨架。这些化合物是两个新的α,α-二取代的β氨基酸(β 2,2 -氨基酸),以及合成路线涉及亲核开环,接着通过酸水解。