Convenient Synthesis of the Central 3,6-Di(2-thiazolyl)-2-(4-thiazolyl)pyridine Skeleton of a Macrocyclic Antibiotic, GE 2270 A
作者:Kazuo Okumura、Hiroyuki Saito、Chung-gi Shin、Kazuyuki Umemura、Juji Yoshimura
DOI:10.1246/bcsj.71.1863
日期:1998.8
It was shown that 6-dimethoxymethyl-1,2-dihydro-2-oxo-3-pyridinecarbonitrile (5) is easily convertible into the titled ring system by a stepwise method. Both the 3-cyano and 6-dimethoxymethyl groups of 5 were converted into 2-thiazolyl groups via the thioamide and carbaldehyde groups by Hantzsch and Shioiri methods, respectively. The 2-pyridone function was changed to a bromoacetyl group via the coupling reaction between the corresponding triflate and ethyl vinyl ether, and then converted into the 4-thiazolyl group. Thus, the useful 3,6-di(2-thiazolyl)-2-(4-thiazolyl)pyridine derivative for the total synthesis of GE 2270 A was obtained. In fact, the method was recently applied to the total synthesis of an antibiotic, micrococcin P, which has a similar central skeleton.
研究表明,6-二甲氧甲基-1,2-二氢-2-氧-3-吡啶碳腈(5)可以通过逐步的方法轻松转化为所述的环系统。5的3-氰和6-二甲氧甲基基团分别通过Hantzsch和Shioiri方法转化为2-噻唑基团,然后将2-吡啶酮功能通过相应的三氟甲烷磺酸酯与乙烯基醚的偶联反应转化为溴乙酰基团,再进一步转化为4-噻唑基团。因此,获得了有助于GE 2270 A全合成的有用的3,6-二(2-噻唑基)-2-(4-噻唑基)吡啶衍生物。实际上,该方法最近还应用于类似中心骨架的抗生素微球菌P的全合成。