A series of C-21 substituted progesterone derivatives (R = F, Cl, Br, CH3) has been prepared, and incubated the C-21 hydroxylating fungus A. niger. No biotransformation was observed where R = Cl, Br, or CH3, but a minor amount of hydroxylation occurred at an unidentified site where R = F. Two C-11β substituted progesterone derivatives (R = F, OH) were converted to the corresponding C-11 ketone by the C-11α hydroxylator R. stolonifer, but a C-11β hydroxylator (C. lunata) was unable to perform a similar transformation with a C-11α hydroxy substrate. C. lunata hydroxylated a C-11β fluoro substrate at C-14α and C-21 in low yield. C-7α and -7β-hydroxy androst-4-ene-3,17-diones were prepared and incubated with C-7β hydroxylating (R. stolonifer) and C-7α hydroxylating (M. griseocyanus) fungi respectively. No ketone formation was observed. Similarly, the C-6β hydroxylator R. arrhizus was unable to transform a C-6α-hydroxy substrate or C-6α- or C-6β-hydroxy-B-norsteroids. No oxidation at halogen was observed for any of the substrates used. 13C–19F coupling constants for 11β-fluoroprogesterone suggest the presence of through space interactions between fluorine and both C-18 and C-19.
一系列C-21取代孕酮衍生物(R = F、Cl、Br、CH3)已经制备,并与C-21羟化真菌A. niger培养。观察到当R = Cl、Br或CH3时未发生生物转化,但当R = F时,在未知位置发生了少量羟基化。两种C-11β取代孕酮衍生物(R = F、OH)被C-11α羟化酶R. stolonifer转化为相应的C-11酮,但C-11β羟化酶(C. lunata)无法使用C-11α羟基底物进行类似转化。C. lunata在低产率下将C-11β氟底物羟化为C-14α和C-21。制备了C-7α和-7β-羟基雄烯-4-烯-3,17-二酮,并分别与C-7β羟化(R. stolonifer)和C-7α羟化(M. griseocyanus)真菌培养。未观察到酮形成。同样,C-6β羟化酶R. arrhizus无法转化C-6α-羟基底物或C-6α-或C-6β-羟基B-诺甾醇。未观察到任何底物的卤素氧化。11β-氟孕酮的13C–19F偶合常数表明氟与C-18和C-19之间存在空间相互作用。