synthesis of a vast variety of heteroatom‐containing cyclobutene‐triflones [bis(trifluoromethylsulfonyl)cyclobutenes] and cyclobutenones has been developed starting from heteroatom‐substituted alkynes and a pyridinium salt (a latent Tf2C=CH2 source). This powerful methodology, involving cyclization reactions, allows for the selective preparation of oxygen‐, nitrogen‐, bromine‐, chlorine‐, iodine‐, sulfur‐
从杂原子取代的炔烃和吡啶鎓盐(潜在的Tf 2 C = CH 2来源)开始,开发了可控制的无金属合成各种杂原子的环丁烯-triflones [双(三氟甲基磺酰基)环丁烯]和环丁烯酮。。这种强大的方法涉及环化反应,可以选择性地制备氧,氮,溴,氯,碘,硫,硒,碲,磷和硅官能化的环丁烯衍生物。
Radical-mediated sulfonyl alkynylation, allylation, and cyanation of propellane
medicinal chemistry. We herein disclose an efficient and practical preparation of sulfonyl alkynyl/allyl/cyano-substituted BCP derivatives through a novel radical-mediated difunctionalization of propellane. The radical alkynylation, allylation, and cyanation processes readily proceed under mild photochemical conditions. The synthetic method features broad functional group tolerance, high product diversity
Cu(i)-catalyzed aerobic cross-dehydrogenative coupling of terminal alkynes with thiols for the construction of alkynyl sulfides
作者:Yong Yang、Weibing Dong、Yisong Guo、Robert M. Rioux
DOI:10.1039/c3gc41330f
日期:——
and selective aerobiccross-dehydrogenativecoupling of terminalalkynes with thiols to construct alkynyl sulfides catalyzed by Cu(I) using molecular oxygen as the oxidant has been demonstrated under mild reaction conditions. The process is applicable to a wide range of alkynes and various thiols and is compatible with a variety of functional groups on both alkyne and thiol coupling partners.
A regioselective method to access fully substituted 5‐trifluoromethylthio‐1,2,3‐triazoles and 5‐thio‐1,2,3‐triazoles from the internal alkynyl trifluoromethyl sulfides and internal thioalkynes by a rhodium(I)‐catalyzed azide‐alkyne cycloaddition (RhAAC) reaction under mild conditions has been developed. This approach features good compatibility with water and air, a broad substrate scope, good functional
A heterogeneous copper-catalyzed direct oxidative cross-dehydrogenativecoupling of terminalalkynes with thiols was achieved in DMSO at 70 °C in the presence of an MCM-41-supported bidentate nitrogen copper(I) complex [MCM-41-2N-CuCl] and K2CO3 under an atmosphere of O2, yielding selectively a variety of alkynyl sulfides in good to excellent yields. This heterogeneous copper catalyst can be easily
在MSO-41负载的双齿氮铜(I)络合物[MCM-41-2N-CuCl]的存在下,在DMSO中于70°C的条件下,末端炔烃与硫醇的异质铜催化直接氧化交叉脱氢偶联反应和在O 2气氛下的K 2 CO 3,以良好至优异的产率选择性地产生各种炔基硫化物。该多相铜催化剂可通过简单的过滤容易地回收并循环10次而活性没有降低。