Racemization of phenanthrene 3,4-oxide. Absolute stereochemistry of cis- and trans-phenanthrene 3,4-dihydrodiols
作者:Derek R. Boyd、Ruth M. E. Greene、John D. Neill、Michael E. Stubbs、Haruhiko Yagi、Donald M. Jerina
DOI:10.1039/p19810001477
日期:——
methods and chemical transformation to compounds of known absolute stereochemistry, have been used to assign absolute stereochemistry to all chiral compounds described in the present study. The availability of optically pure diols (11) and (12) has allowed the absolute stereochemistry of the trans- and cis-3,4-dihydrodiol metabolites of phenanthrene (4) and (2) to be determined as (–)-(3R,4R) and (+)-(3S
反式-3,4-二羟基-1,2,3,4-四氢菲(11)和顺式-3,4-二羟基-1,2,3,4-四氢菲(12)通过以下方法制备为光学纯形式: (i)色谱分离反式-3-溴4-薄荷基氧基乙酰氧基-1,2,3,4-四氢菲非对映异构体(7a),(7b),(ii)将(7a)转化为光学纯(+) -四氢-3,4-环氧化物(8),(iii)酸催化(+)-(8)水解,通过攻击C-4产生(+)-反式-(11)和(–)-顺式-(12)。包括光谱方法和化学转化为已知绝对立体化学的化合物在内的多种证据已用于将绝对立体化学分配给本研究中描述的所有手性化合物。光学纯的二醇(11)和所述的可用性(12)已经允许的绝对立体化学反式-和顺-3,4-二氢二醇菲的代谢物(4)和(2)被确定为( - ) - (3- R,4 R)和(+)-(3 S,4 R)。由光学纯的前体制备的菲的初始哺乳动物代谢物菲3,4-氧化物具有光学活性,但在环境温度下自发消旋。