Synthesis, Absolute Configuration, and Enantioselectivity of Antiretroviral Effect of (R)-(-)- and (S)-(+)-Cytallene. Lipase-Catalyzed Enantioselective Acylations of (.+-.)-N4-Acylcytallenes
作者:Bryan C. N. M. Jones、James V. Silverton、Claire Simons、Sreenivasulu Megati、Hisao Nishimura、Yosuke Maeda、Hiroaki Mitsuya、Jiri Zemlicka
DOI:10.1021/jm00008a018
日期:1995.4
acylations of (+/-)-cytallene (1b), (+/-)-N4-acetylcytallene (11a), (+/-)-N4-benzoylcytallene (11b), and (+/-)-N4-(9-fluorenylmethoxycarbonyl)cytallene (11c) using vinyl butyrate or acetate catalyzed by lipases in organic solvents was investigated. Reactions with 1b, 11a, and adenallene (1a) did not display a high enantioselectivity but all resulted in a predominant acylation of the (-)-enantiomers. Application
(+/-)-邻苯三茂(1b),(+/-)-N4-乙酰基邻苯三烯(11a),(+/-)-N4-苯甲酰基邻苯三烯(11b)和(+/-)-N4-的酰化的对映选择性研究了在有机溶剂中脂肪酶催化丁酸乙烯酯或乙酸乙烯酯合成的(9-芴基甲氧基羰基)并三苯甲基(11c)。与1b,11a和腺嘌呤(1a)的反应未显示出高对映选择性,但全部导致了(-)-对映异构体的酰化反应。Lowe-Brewster规则的应用导致R配置暂时分配给所有酰化产品。对(+/-)-N4-苯甲酰基环戊烯(11b)在氯仿,四氢呋喃(THF),四氢吡喃(THP),四氢噻吩(THT)和二恶烷中用脂肪酶PS30和/或AK酰化的时间过程的研究表明,脂肪酶AK催化的THF中的反应是最有希望的拆分11b的方法。确实,中间体3e和10d分离和脱保护后,(+)-和(-)-Cytallene(3c和2b)进行大规模酰化后,收率和对映选择性都很高。11c在T