已开发出一种新的可见光光催化芳基磺酰化和C(sp 3)系的1,7-烯炔与亚磺酸的双环化,可提供官能化的含砜苯并[ a ]芴-5酮,且收率普遍良好。这种曙红Y催化方法利用可见光作为一种安全且生态友好的能源来驱动级联环化反应,从而导致连续的多个成键事件(包括C–S和C–C键)有效地构建多环连接的烷基芳基砜。
8‐halosulfonylation of β‐alkynylketones with haloaryl diazonium tetrafluoroborates and DABCO.bis(sulfur dioxide) was first achieved via the cleavage/recombination of C(sp3)−C(sp3) and C(sp2)‐halogen bonds, from which 47 examples of sulfone‐containing 1,3‐dimethylene‐substituted (Z,Z)‐isobenzofurans as single stereoisomers were synthesized in generally good yields. This multicomponent pathway is proposed to
can be selectively controlled toward the formation of two families of skeletally diverse benzo[g]indoles and 1-naphthols under mild conditions. Silver salt was found to efficiently promote indole annulation to give multifunctional benzo[g]indoles with the installation of two sulfonyl groups into the indole ring via N–S and N–F bond cleavage of NFSI, whereas NBS and NCS-mediated benzannulations occurred
已经建立了苯连接的烯-炔的新型碳-碳三键断裂和重排反应。在温和的条件下,可以选择性地控制反应,以形成两个不同骨架的苯并[ g ]吲哚和1-萘酚。发现银盐可有效促进吲哚环化,并通过NFSI的N–S和N–F键裂解,在吲哚环中安装两个磺酰基,从而形成多功能的苯并[ g ]吲哚,而NBS和NCS介导的苯环发生在二卤代1-萘酚的形成。
Au(<scp>i</scp>)-catalyzed triple bond alkoxylation/dienolether aromaticity-driven cascade cyclization to naphthalenes
A novel strategy for the synthesis of multisubstituted naphthalenes was developed via a Au(i)-catalyzed alkyne alkoxylation/dienolether aromaticity-driven cascade cyclization using 1,5-enyne substrates. The functional group toleration was examined by synthesizing a series of substrates and the mechanism was also studied based on intermediates isolated through deuterium labeling experiments.
Cu(OAc)<sub>2</sub>-Catalyzed Aerobic Oxidative Dehydrogenation Coupling: Synthesis of Heptacyclic Quinolizino[3,4,5,6-<i>kla</i>]perimidines
作者:Bin-Bin Feng、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1021/acs.joc.6b02644
日期:2017.2.3
oxidative dehydrogenation coupling to access heptacyclic quinolizino[3,4,5,6-kla]perimidines. In this reaction, the formation of three new rings and four new bonds was achieved in a functional-group-compatible fashion, allowing a facile method toward fused aza-heterocycles containing both quinolizine and perimidine moieties.
Two types of new oxidant-free radical multicomponent reactions of β-alkynyl ketones, aryldiazonium salts, and DABCO·(SO2)2 (DABSO) were established, leading to the tunable generation of two class of sulfonated 1,3-dihydroisobenzofurans with moderate to good yields and complete stereoselectivity under the mild conditions. The radical-induced scission/recombination of the C(sp3)-C(sp3) bond enabled direct