Enantioselective Hydroarylation or Hydroalkenylation of Benzo[<i>b</i>]thiophene 1,1-Dioxides with Organoboranes
作者:Fangdong Hu、Jie Jia、Ximing Li、Ying Xia
DOI:10.1021/acs.orglett.0c04114
日期:2021.2.5
protocol for the asymmetric hydroarylation and hydroalkenylation of benzo[b]thiophene 1,1-dioxides with organoboranes has been developed. The combination of a rhodium(I) precatalyst and a chiral diene ligand constitutes the catalytic system, which enables the facile synthesis of 2,3-dihydrobenzo[b]thiophene 1,1-dioxides in good yields with high enantioselectivities. The merging of this asymmetric hydroarylation
已开发出一种有效的方案,用于有机硼烷对苯并[ b ]噻吩1,1-二氧化物的不对称加氢芳基化和加氢烯基化反应。铑(I)预催化剂和手性二烯配体的组合构成了催化体系,该体系能够以高收率和高对映选择性轻松合成2,3-二氢苯并[ b ]噻吩1,1-二氧化物。该不对称氢芳基化与下游烷基化的合并以非对映异构的方式提供了包含两个具有高对映选择性的连续的季立体中心的2,3-二氢苯并[ b ]噻吩1,1-二氧化物。
Diels–Alder reaction of tetraarylcyclopentadienones with benzo[<i>b</i>]thiophene <i>S</i>,<i>S</i>-dioxides: an unprecedented de-oxygenation <i>vs.</i> sulfur dioxide extrusion
作者:Palani Manikandan、Jayachandran Karunakaran、Elumalai Varathan、Georg Schreckenbach、Arasambattu K Mohanakrishnan
DOI:10.1039/d0cc05842d
日期:——
benzo[b]thiophene dioxides in xylenes at reflux led to the formation of tetra aryl-substituted dibenzothiophene as well as penta aryl-substituted benzene analogues depending on the influence of aryl substituents present on cyclopentadienones. The intermediate dihydrodibenzothiophene-dioxides underwent aromatization either through de-oxygenation or extrusion of sulfur dioxide to furnish substituted dibenzothiophenes
四芳基环戊二烯酮与二甲苯中的苯并[ b ]噻吩二氧化物在回流下的Diels-Alder反应导致四芳基取代的二苯并噻吩以及五芳基取代的苯类似物的形成,具体取决于芳基取代基对环戊二烯的影响。中间体二氢二苯并噻吩二氧化物通过脱氧或挤出二氧化硫进行芳构化,以提供取代的二苯并噻吩或苯。
Catalytic [2 + 2 + 2] Cycloaddition of Benzothiophene Dioxides with α,ω-Diynes for the Synthesis of Condensed Polycyclic Compounds
A Rh-catalyzed intermolecular [2 + 2 + 2] cycloaddition of the 2,3-double bond of benzothiophene dioxides with α,ω-diynes gave sulfone-containing cycloadducts in high yields. This is the first example of a catalytic [2 + 2 + 2] cycloaddition that uses the 2,3-double bond of a heterole as an ene moiety. The consecutive reaction of benzodithiophene tetraoxide with 2,3-naphthylene-tethered 1,7-diyne gave
Cobalt-Catalyzed Oxidative Annulation of Benzothiophene-[<i>b</i>]-1,1-dioxide through Diastereoselective Double C–H Activation
作者:Subban Kathiravan、Ian A. Nicholls
DOI:10.1021/acs.orglett.9b03158
日期:2019.12.20
The use of inexpensive base metal catalysis to perform C-H activation is an active field of research in organic synthesis. Described herein is a sustainable cobalt-catalyzed diastereoselectiveoxidative annulation/double C-H activation of benzothiophene-[b]-1,1-dioxide with aminoquinolinamides under mild reaction conditions for the synthesis of annulated benzothiophenes.
Organocatalytic enantioselective tandem sulfa-Michael/aldol reaction to access dihydrothiopyran-fused benzosulfolane skeletons bearing three contiguous stereocenters
The first organocatalytic diastereo- and enantioselective tandem sulfa-Michael/aldol reaction of 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes with benzo[b]thiophene sulfones was developed. With multiple hydrogen-bonding thiourea as a catalyst, a wide range of polycyclic dihydrothiopyran-fused benzosulfolanes were smoothly obtained with excellent results (up to 99% yield, >20 : 1 dr
开发了第一个2-巯基吲哚-3-甲醛和2-巯基苯甲醛与苯并[ b ]噻吩砜的有机催化非对映和对映选择性磺胺-迈克尔/羟醛反应。用多种氢键合的硫脲作为催化剂,在温和的反应条件下,可以顺利获得各种多环二氢硫吡喃稠合的苯并砜类化合物,并具有优异的结果(产率高达99%,> 20:1 dr和99%ee)。