An Efficient Enzymatic Synthesis of Benzocispentacin and Its New Six- and Seven-Membered Homologues
作者:Enikő Forró、Ferenc Fülöp
DOI:10.1002/chem.200501286
日期:2006.3.8
A very efficient enzymatic method was developed for the synthesis of new enantiomeric benzocispentacin and its six- and seven-membered homologues through the Lipolase (lipase B from Candida antarctica) catalyzed enantioselective (E > 200) ring opening of 3,4-benzo-6-azabicyclo[3.2.0]heptan-7-one, 4,5-benzo-7-azabicyclo[4.2.0]octan-8-one, and 5,6-benzo-8-azabicyclo[5.2.0]nonan-9-one with H2O in iPr2O
开发了一种非常有效的酶促方法,用于通过Lipolase(南极假丝酵母的脂肪酶B)催化3,4-苯并-6的对映选择性(E> 200)开环,合成新的对映体苯并顺铂及其六元和七元同系物。 -氮杂双环[3.2.0]庚-7-,4,5-苯并-7-氮杂双环[4.2.0] octan-8-和5,6-苯并-8-氮杂双[5.2.0]壬南- 9-1与60°C的iPr2O中的H2O。(1R,2R)-β-氨基酸(ee>或= 96%,收率>或= 40%)和(1S,6S)-,(1S,7S )和(1S,8S)-β-内酰胺类(ee> 99%,收率>或= 44%)可以很容易地分离出来。外消旋和对映体β-内酰胺与18%HCl的开环得到相应的β-氨基酸盐酸盐。