An unprecedented Pd(II)-catalyzed decarbonylative C–H/C–C activation and annulationreaction, which proceeds via intramolecular cyclization, is reported. This reaction of hydroxynaphthoquinones with disubstituted alkynes provides good yields of substituted alkylidene phthalides, which are the key intermediates for the synthesis of bioactive natural products.
Ruthenium(II)-Catalyzed Synthesis of Spirobenzofuranones by a Decarbonylative Annulation Reaction
作者:Partha P. Kaishap、Gauri Duarah、Bipul Sarma、Dipak Chetia、Sanjib Gogoi
DOI:10.1002/anie.201710049
日期:2018.1.8
activation of six‐membered compounds is reported. The Ru‐catalyzed reaction of 3‐hydroxy‐2‐phenyl‐chromones with alkynes works most efficiently in the presence of the ligand PPh3 to provide spiro‐indenebenzofuranones. Unlike previously reported metal‐catalyzed decarbonylative annulation reactions, in the present decarbonylative annulation reaction, the annulation occurs before extrusion of carbon monoxide
据报道,炔烃通过六元化合物的C / H / C-C活化而首次脱羰基插入。在配体PPh 3存在下,Ru-催化的3-羟基-2-苯基色酮与炔烃的反应最有效,可提供螺茚二苯并呋喃酮。与以前报道的金属催化的脱羰环化反应不同,在本脱羰环化反应中,环化发生在一氧化碳挤出之前。
Palladium-catalyzed allylation of sulfonyl hydrazides with alkynes to synthesize allylic arylsulfones
作者:Chuan-Jun Lu、Hong Chen、Dong-Kai Chen、Hong Wang、Zhen-Ping Yang、Jianrong Gao、Hongwei Jin
DOI:10.1039/c6ob01929c
日期:——
A novel method for the construction of allyl sulfone derivatives was developed by palladium catalyzed allylation of sulfony hydrazides with alkynes.
通过钯催化磺酰肼与炔烃的烯丙基化反应,开发出了一种构建烯丙基砜衍生物的新方法。
Copper‐Catalyzed Synthesis of Tetrasubstituted Alkenes via Regio‐ and
<i>anti</i>
‐Selective Addition of Silylboronates to Internal Alkynes
作者:Hirokazu Moniwa、Ryo Shintani
DOI:10.1002/chem.202100933
日期:2021.5.12
As a new and complementary method for the synthesis of structurally defined tetrasubstituted alkenes, a copper‐catalyzed regio‐ and anti‐selectiveaddition of silylboronates to unsymmetric internal alkynes has been developed. A variety of unactivated alkynes can be employed with high selectivity under simple and mild conditions, and the resulting products have been further functionalized by utilizing
Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes
作者:Zhong Zhang、Yuzheng Luo、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1039/c9sc00568d
日期:——
Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method