作者:Asit Chakraborti、U. Banerjee、Linga Banoth、Bhukya Chandarrao、Brahmam Pujala
DOI:10.1055/s-0033-1340465
日期:——
tert-butylamine. The (R)- and (S)-acetates, obtained enzymatically were deacetylated to the corresponding alcohol by chemical hydrolysis and further converted into (S)-and and (R)-bunitrolol by chemical means. This is the first chemoenzymatic synthesis of both of the enantiomers of the drug. (RS)-, (R)-, and (S)-Bunitrolol were also synthesized following the ‘all chemical’ routes from (RS)-, (R)-, and (S)-epichlorohydrin
摘要 据报道,β-肾上腺素能受体阻断剂苯尼洛尔是一种新的化学方法,也是第一个化学酶法合成,呈外消旋(RS)和对映体富集形式(R和S)。中间体(R)-和(S)-1-氯-3-(2-氰基苯氧基)丙-2-醇中间体是通过酶动力学拆分由相应的外消旋醇合成的。市售脂肪酶PS-C和CCL在外消旋醇与乙酸乙烯酯的酯交换过程中表现出互补的对映选择性,提供(R)-醇与(S)-乙酸酯和(S)-醇与(R))-乙酸盐,分别代表用于逆转对映选择性的酶促开关的一个例子。优化了温度,时间,底物和酶的浓度以及反应介质等各种反应参数对活性和对映选择性的影响。通过用叔丁胺处理,将(R)-和(S)-醇分别转化为(S)-和和(R)-布尼特洛尔。酶法获得的(R)-和(S)-乙酸盐通过化学水解脱乙酰基化为相应的醇,并进一步转化为(S)-和(R)-bunitrolol通过化学方法。这是该药物的两种对映异构体的首次化学合成。(RS) - ,(-