(+/-)-Tulipalin B was prepared in six steps from phenyl sulfide and ethyl 2-bromopropionate. The sensitizing power in the skin of (+/-)-tulipalin A (1a) and B (1b) and of the beta-acetoxy derivatives (1c) was studied. All are able to induce allergic contact dermatitis (ACD) and give cross-reactions. gamma,gamma-Disubstituted analogues (with a -(CH2)5- chain in the gamma-position) were synthesized and used to induce ACD in guinea pigs: they all were sensitizers and cross-reacted. However no cross-reaction was demonstrated between gamma,gamma-unsubstituted and gamma,gamma-substituted compounds showing a great specificity of ACD.
(+/−)-Tulipalin B 起自苯
硫醚和
乙酸2-
溴丙酯,六个步骤完成制备。研究发现,皮肤中 (+/−)-tulipalin A(1a)和 B(1b)及其β-乙氧基衍
生物(1c)均具有致敏能力。所有这些物质均能引发过敏性接触性皮炎(ACD),并呈现交叉反应。制备了γ,γ-二取代类似物(γ位带有 -(
CH2)5- 链),在豚鼠实验中引发 ACD:所有
配体均为致敏剂,并呈现交叉反应。然而,γ,γ-未取代和 γ,γ-取代化合物之间未显示交叉反应,证明了 ACD 具有高度特异性。