amide resin. The nitro group was reduced to its amine with concomitant cleavage of the disulfide bond using SnCl2·2H2O to afford 2. Condensation of an aldehyde and nucleophilic attack on an α,β-unsaturated ketone, followed by TFA cleavage from the resin, gave benzothiazole 3 and 2,3-dihydro-[1,5]-benzothiazepine 4, respectively.
将双-(2-硝基-4-羧基苯基)二
硫化物装载在Wang
树脂和Rink酰胺
树脂上。使用SnCl 2 ·2H 2 O伴随着二
硫键的裂解,将硝基还原为胺基,得到2。醛的缩合和对α,β-不饱和酮的亲核攻击,然后从
树脂上裂解TFA,分别得到
苯并噻唑3和2,3-二氢-[1,5]-苯并噻
庚烷4。