Efficient Preparation of Highly Optically Active (S)-(−)-2,3-Allenols and (R)-(+)-2,3-Allenyl Acetates by a Clean Novozym-435-Catalyzed Enzymatic Separation of Racemic 2,3-Allenols
作者:Daiwang Xu、Zuyi Li、Shengming Ma
DOI:10.1002/1521-3765(20021104)8:21<5012::aid-chem5012>3.0.co;2-2
日期:2002.11.4
of racemic 2,3-allenols, affording highly optically active (S)-(-)-2,3-allenols and (R)-(+)-2,3-allenyl acetates in high yields and with excellent ee values. The reaction of 3-(n-butyl)-3,4-pentadien-2-ol (1 a) was successfully performed on a 10 g scale to afford the corresponding (S)-(-)-2,3-allenol (1 a) and (R)-(+)-2,3-allenyl acetate (2 a) in synthetically useful amounts and with high ee values
已发现Novozym-435是有效的生物催化剂,可动力学拆分一系列外消旋的2,3-烯丙醇,提供高度旋光的(S)-(-)-2,3-烯丙醇和(R)-(+ )-2,3-烯丙乙酸酯,收率高,具有出色的ee值。3-(正丁基)-3,4-戊二烯-2-醇(1a)的反应以10 g规模成功进行,得到了相应的(S)-(-)-2,3-allenol( 1a)和(R)-(+)-2,3-烯丙基乙酸酯(2a)具有合成上的有用量,并且具有较高的ee值。该反应的优点是原料容易获得,(-)-2,3-烯丙醇和(+)-2,3-烯丙基乙酸酯的高立体选择性,使用相对高的底物浓度以及催化剂用量降低。可以将所得的(S)-(-)-2,3-allenol 1a转化为相应的手性2,