Preparation, Structure, and Reactivity of Thioxo and Imino Derivatives of the Triolide (and Pentolide) from (<i>R</i>)-3-Hydroxybutanoic Acid
作者:Andreas Brunner、Florian N. M. Kühnle、Dieter Seebach
DOI:10.1002/hlca.19960790202
日期:1996.3.20
Reaction of the triolide 1 from (R)-3-hydroxybutanoic acid with Lawesson's reagent 5 leads to the mono-, di-, and trithio derivatives 6–8 which can be isolated in pure form (20–40% yields), and which have crystal structures very similar to the parent triolide 1 (Fig. 1). Similarly, pentolide 3 is converted to mixtures of various thio derivatives, three of which are separated (10–12) by HPLC and fully
(R)-3-羟基丁酸中的三醇化物1与Lawesson试剂5的反应可生成单,二和三硫代衍生物6-8,可以将其分离为纯净形式(20-40%的收率),并且其晶体结构与母体三醇化物1(图1)非常相似。同样,戊内酯3转化为各种硫代衍生物的混合物,其中三种通过HPLC分离(10-12)并得到充分表征。二硫代戊内酯(10、12)之一的X射线结构和彼此之间的X射线结构显着不同(图3))。硫代三醇化物6-8(NaBH 4,R 3 SnH,Cl 3 SiH,Raney -Ni)的还原得到的12元环含多达三个醚基(手性冠醚,15、17-19),收率低。硫代三醇化物与氨,某些伯胺和羟胺自发反应,收率高达96%,生成具有完整的12元环骨架的亚胺和肟衍生物(20、22-24、30,见图1和2的晶体结构)。 4–7)。三羟化物1的所有衍生物的刚性结构将CO,CS和CNR O-,S-和N原子并列放置(该特征使人联想到铁结