Use of Dibutyl[14C]formamide as a Formylating Reagent in theVilsmeier-Haack Reaction and Synthesis of a14C-Labeled Novel Phosphodiesterase-4 (PDE-4) Inhibitor
作者:Jonathan Z. Ho、Charles S. Elmore、Michael A. Wallace、Dan Yao、Matthew P. Braun、Dennis C. Dean、David G. Melillo、Cheng-yi Chen
DOI:10.1002/hlca.200590075
日期:2005.5
high-yielding synthesis of dibutyl[14C]formamide ([14C]DBF; 1) from 14CO2 was developed (Scheme 1): reaction of LiBEt3H and 14CO2 followed by aqueous workup gave H14CO2H in high yield. Conversion of the [14C]formic acid to 1 was effected by a standard carbodiimide coupling procedure. The utility of 1 as an alternative to dimethyl[14C]formamide ([14C]DMF) in alkylation reactions and in the [14C]Vilsmeier–Haack
开发了一种由14 CO 2简单,高产的二丁基[ 14 C]甲酰胺([ 14 C] DBF; 1)的合成方案(方案1):LiBEt 3 H和14 CO 2反应,然后进行水后处理,得到H 14 CO 2的H高产率。通过标准的碳二亚胺偶联方法将[ 14 C]甲酸转化为1。的效用1作为替代二甲基[ 14 C]甲酰胺([ 14 C] DMF)在烷基化反应和在[ 14C]证明了几种底物的Vilsmeier-Haack反应(表2)。甲14 C标记的磷酸二酯酶-4(PDE-4)抑制剂,[ 14 C] - 2,通过应用这种技术的(合成流程2)。