Cu-catalyzed in situ generation of thiol using xanthate as a thiol surrogate for the one-pot synthesis of benzothiazoles and benzothiophenes
作者:D. J. C. Prasad、G. Sekar
DOI:10.1039/c3ob26915a
日期:——
A new copper-catalyzed in situ generation of aryl thiolates strategy was successfully developed for the one-potsynthesis of substituted benzothiazoles from 2-iodoanilides using xanthate as a thiol precursor. A wide range of 2-iodoanilides with both electron-releasing and electron-withdrawing groups produced the corresponding benzothiazoles in good yields. Further, this one-pot protocol was successfully
成功开发了一种新的铜催化原位生成的芳基硫醇盐策略,该方法可使用以下方法一锅法从2-碘代苯胺合成一取代的苯并噻唑黄药作为硫醇的前体。具有电子释放基团和电子吸收基团的各种2-碘代苯胺以良好的产率产生相应的苯并噻唑。此外,该一锅法协议已成功用于合成有效的抗肿瘤药2-(3,4-二甲氧基苯基)-5-氟苯并[ d ]噻唑(PMX 610)。最后,铜催化原位生成芳基硫醇盐策略成功地用于邻卤代炔基苯的多米诺合成,该方法是使用邻卤代炔基苯黄药 作为硫醇的前体。
With the application of Ac in sulfoximine as a protecting group (PG) and MeOH as a de-PG agent, Pd-catalyzed multicomponent reactions were developed to access indene-fused medium-size sulfoximine heterocycles.
Diaceno[<i>a</i>,<i>e</i>]pentalenes from Homoannulations of <i>o</i>-Alkynylaryliodides Utilizing a Unique Pd(OAc)<sub>2</sub>/<i>n</i>-Bu<sub>4</sub>NOAc Catalytic Combination
A heterogeneous catalytic system, Pd(OAc)(2)/n-Bu4NOAc, for the efficient synthesis of diaceno[a,e)pentalenes via a tandem Pd catalytic cycle is reported. The catalytic partner n-Bu4NOAc played indispensable and versatile roles, acting as both the media for recovering active Pd(0) species and their stabilizer. A series of new diaceno[a,dpentalenes were obtained in moderate to high yields, among which the octacydic dianthracenopentalene was found to be highly emissive.
Synthesis of Indeno[1,2-<i>c</i>]furans via a Pd-Catalyzed Bicyclization of 2-Alkynyliodobenzene and Propargylic Alcohol
作者:Jisong Jin、Yan Luo、Chao Zhou、Xiaopeng Chen、Qiaodong Wen、Ping Lu、Yanguang Wang
DOI:10.1021/jo302223y
日期:2012.12.21
A general and efficient synthesis of indeno[1,2]furans via a Pd-catalyzed bicyclization reaction between 2-alkynyliodobenzenes and propargylic: alcohols is described. The procedure furnishes indeno[1,2]furans with moderate to excellent yields (51%-78%) and a broad substrate scope. The cascade process combines the formation of one C-O bond and two C-C bonds in a single step.