Palladium−Copper Catalyzed Synthesis of Benzofused Heterocycles with Two Heteroatoms: Novel and Highly Regio- and Stereoselective Syntheses of (<i>E</i>)-2-(2-Arylvinyl)-3-tosyl-2,3-dihydro-1,3-benzothiazoles and (<i>E</i>)-2-Alkyl(aryl)idene-3,4-dihydro-2<i>H</i>-1,4-benzothiazines
作者:Nitya G. Kundu、Bidisha Nandi
DOI:10.1021/jo001783+
日期:2001.6.1
A highly novel, general, and convenient palladium and copper-catalyzed procedure has been developed for the synthesis of (E)-2-(2-arylvinyl)-3-tosyl-2,3-dihydro-1,3-benzothiazoles 28-40. 3-(2-Aminophenylthio)prop-1-yne 1 reacts with aryl iodides 2-14 under palladium-copper catalysis to yield the disubstituted alkynes 15-27 which after tosylation undergo a novel cyclization with CuI in the presence
已开发出一种高度新颖,通用且方便的钯和铜催化方法,用于合成(E)-2-(2-芳基乙烯基)-3-甲苯磺酰基-2,3-二氢-1,3-苯并噻唑28- 40 3-(2-氨基苯硫基)丙-1-炔1在钯-铜催化下与芳基碘化物2-14反应生成双取代炔烃15-27,甲苯磺酸化后,在THF中在三乙胺存在下用CuI进行新型环化反应(E)-2-(2-芳基乙烯基)-3-甲苯基-2,3-二氢-1,3-苯并噻唑28-40,而不是预期的3-亚烷基-4-甲苯基-3,4-二氢-2H -1,4-苯并噻嗪41.反应具有很高的区域选择性和立体选择性。还报道了2-(2-芳基乙基)-3-甲苯基苯并噻唑啉42-47、2-(2-芳基乙烯基)苯并噻唑48-54和具有潜在生物学重要性的新型5-取代尿嘧啶衍生物55的合成。同样,S- [2-(N-prop-2'-炔基)氨基苯基] -N,N-二甲基硫代氨基甲酸酯58与芳基碘化物的钯铜催化的芳基化反