Synthesis and transformations of stereoisomeric ethyl 2-isothiocyanato-1-cyclopentanecarboxylatesm
作者:Márta Palkó、Ferenc Fülöp、Ferenc Evanics、Gábor Bernáth
DOI:10.1002/jhet.5570370419
日期:2000.7
Ethyl vis- and trans-2-isothiocyanato-1-cyclopentanecarboxylates 2 and 7 were prepared by the reaction of the corresponding alicyclic ethyl 2-amino-1-carboxylates and thiophosgene. The cis-isothiocyanato compound 2 underwent ring closure with amines in one or two steps, resulting in 3-substituted-cis-2-thioxocyclopenta[d]pyrimidin-4-ones 3a-g. The trans isomer 7 failed to cyclize, but gave carboxamide
乙基可见-和反式-2-异硫氰基-1- cyclopentanecarboxylates 2和7分别用对应的脂环2-氨基-1-羧酸酯和硫光气反应制得。所述顺式-isothiocyanato化合物2后行环闭合与胺在一个或两个步骤,产生3-取代的-顺-2- thioxocyclopenta [ d ]嘧啶-4-酮3A-G。所述反式异构体7未能环化,但得到甲酰胺8A,8B或硫脲酯衍生物9A,B。