Microbial oxygenation of cycloheptyl-N-phenylcarbamate and (±)-trans-2-fluorocycloheptyl-N-phenylcarbamate with beauveria bassiana
作者:Sylke Pietz、Roland Fröhlich、Günter Haufe
DOI:10.1016/s0040-4020(97)10147-8
日期:1997.12
The title biotransformation of 1 gave trans-4-hydroxycyclohept-1-yl-carbamate (3, 10%, 62% ee), its consecutive ketone 5 (12%) and the racemic cis-isomer 4 (1.8%). Similarly, the racemic trans-2-fluoro analogue 2 yielded mainly four optically active alcohols 7 (24%,, 82% ee), 8 (8%, 16% ee), 9 (4.5%, 52% ee) and 10 (5%, 79% ee) by partial kinetic resolution. The fluorine substituent near the anchoring
的标题生物转化1,得到反式-4- hydroxycyclohept -1-基-氨基甲酸酯(3,10%,62%ee)的,其连续的酮5(12%)和外消旋的顺式-异构体4(1.8%)。同样,外消旋反-2-氟类似物2主要产生四种旋光醇7(24%,82%ee),8(8%,16%ee),9(4.5%,52%ee)和10(5%,79%ee)通过部分动力学拆分。富锚电子基团附近的氟取代基引起区域和非对映选择性的显着下降,但增加了对映选择性。显然,在这个位置上不仅仅存在氢的等位取代,而且氟的电子效应强烈地影响了结合方式。可能1和2的两个对映异构体可以不同的几何形状连接到酶的活性位点。