Process for the preparation of disubstituted acetylenes bearing heteroaromatic and heterobicyclic groups
申请人:Kumar Venkata Siva Bobba
公开号:US20060106233A1
公开(公告)日:2006-05-18
A process for the preparation of a disubstituted acetylene bearing heteroaromatic and heterobicyclic groups of formula I is provided
wherein X is S, O, or NR
1
wherein R
1
is hydrogen or a C
1
-C
6
straight or branched alkyl group; R is hydrogen or a C
1
-C
6
straight or branched alkyl group; A is a substituted or unsubstituted pyridinyl, thienyl, furyl, pyridazinyl, pyrimidinyl or pyrazinyl group; n is 0-4; and B is H, —COOH, —CH
2
OH, —CHO or a C
1
-C
6
alkyl acetal derivative, —COR
2
or a C
1
-C
6
alkyl ketal derivative where R
2
is —(CH
2
)
m
CH
3
where m is 0-4 or COOR
3
wherein R
3
is a straight or branched C
1
-C
30
alkyl group, a substituted or unsubstituted C
6
-C
30
aromatic group, a substituted or unsubstituted C
3
-C
30
cycloalkyl, a substituted or unsubstituted C
3
-C
30
cycloalkylalkyl, a substituted or unsubstituted C
3
-C
30
cycloalkenyl, a substituted or unsubstituted C
5
-C
30
aryl, a substituted or unsubstituted C
5
-C
30
arylalkyl, a substituted or unsubstituted C
5
-C
30
heteroaryl, a substituted or unsubstituted C
3
-C
30
heterocyclic ring, a substituted or unsubstituted C
4
-C
30
heterocyclylalkyl, a substituted or unsubstituted C
6
-C
30
heteroarylalkyl, the process comprising a Sonogashira coupling reaction between a compound of formula II
wherein X and R have the aforestated meanings, with a compound of formula III
X′-A-(CH
2
)
n
—B (III)
wherein X′ is a halogen and A, n and B have the aforestated meanings, in the presence of a base and a transition metal catalyst and in a polar aprotic solvent.
提供了一种制备公式I中含有杂原子芳香和杂环的二取代乙炔的方法,其中X为S、O或NR1,其中R1为氢或C1-C6直链或支链烷基;R为氢或C1-C6直链或支链烷基;A为取代或未取代的吡啶基、噻吩基、呋喃基、吡嗪基、嘧啶基或吡嗪基;n为0-4;B为H、-COOH、-CH2OH、-CHO或C1-C6烷基缩醛衍生物、-COR2或C1-C6烷基缩酮衍生物,其中R2为-(CH2)mCH3,其中m为0-4或COOR3,其中R3为直链或支链C1-C30烷基、取代或未取代C6-C30芳香基、取代或未取代C3-C30环烷基、取代或未取代C3-C30环烷基烷基、取代或未取代C3-C30环烯基、取代或未取代C5-C30芳基、取代或未取代C5-C30芳基烷基、取代或未取代C5-C30杂芳基、取代或未取代C3-C30杂环、取代或未取代C4-C30杂环基烷基、取代或未取代C6-C30杂芳基烷基,该方法包括在极性无水溶剂中,在碱和过渡金属催化剂的存在下,通过公式II的化合物与公式III的化合物进行Sonogashira偶联反应,其中X和R具有上述含义,X'为卤素,A、n和B具有上述含义。