a structural analogue of Kamiya's disulphide (1a), has been synthesized. Some cyclization reactions of the disulphides (1)(Br2 in CH2Cl2 and AcOAg in ClCH2CO2H–CH2Cl2) leading to penam and cepham derivatives through episulphonium ions (2), have been studied. The data obtained show that changing the substituent X in (1a) and (1b) brings about changes in the distribution of the positive charge in the
已经合成了神谷二
硫化物(1a)的结构类似物二氮杂
环丁酮(1b)。研究了二
硫化物(1)(CH 2 Cl 2中的Br 2和ClCH 2 CO 2 H–CH 2 Cl 2中的AcOAg)通过epi
磺酸根离子(2)导致
戊二烯和cepham衍
生物的一些环化反应。所获得的数据表明,改变(1a)和(1b)中的取代基X导致中间epi上离子(2a)和(2b)中正电荷的分布发生变化,因此在一定程度上影响了该基团的区域选择性。 s开环和(1a)和(1b)的
化学行为。