Copper-Catalyzed Enantioselective Hydroalkoxylation of Alkenols for the Synthesis of Cyclic Ethers
作者:Dake Chen、Ilyas A. Berhane、Sherry R. Chemler
DOI:10.1021/acs.orglett.0c01691
日期:2020.10.2
The copper-catalyzedenantioselective intramolecular hydroalkoxylation of unactivated alkenes for the synthesis of tetrahydrofurans, phthalans, isochromans, and morpholines from 4- and 5-alkenols is reported. The substrate scope is complementary to existing enantioselective alkene hydroalkoxylations and is broad with respect to substrate backbone and alkene substitution. The asymmetric induction and
Visible-Light Photoredox-Catalyzed Sulfonyl Lactonization of Alkenoic Acids with Sulfonyl Chlorides for Sulfonyl Lactone Synthesis
作者:Wei-Hao Rao、Qi Li、Fang-Yuan Chen、Li-Li Jiang、Pan Xu、Xue-Wan Deng、Ming Li、Guo-Dong Zou、Xinhua Cao
DOI:10.1021/acs.joc.1c01378
日期:2021.9.3
A visible-light photoredox-catalyzed sulfonyl lactonization of unsaturated carboxylic acids with sulfonyl chlorides is described. This reaction features good functional group tolerance and a broad substrate scope, providing a simple and efficient protocol to access a wide range of sulfonyl lactones in high to excellent yields. Preliminary mechanistic investigations suggested that a free-radical pathway
Carboxy-directed asymmetric hydrogenation of α-alkyl-α-aryl terminal olefins: highly enantioselective and chemoselective access to a chiral benzylmethyl center
A carboxy-directedasymmetrichydrogenation of α-alkyl-α-aryl terminal olefins was developed by using a chiral spiro iridium catalyst, providing a highly efficient approach to the compounds with a chiral benzylmethyl center. The carboxy-directedhydrogenation prohibited the isomerization of the terminal olefins, and realized the chemoselective hydrogenation of various dienes. The concise enantioselective
A palladium-catalyzedintramolecular isoindolinone-forming aminooxygenation of alkenes with 1 atm of oxygen as oxidant is reported. A variety of functionalized alkenes and carboxylic acids can be used, and high yields were observed. Preliminary mechanistic studies revealed that the aminooxygenation products were formed through the oxidation of a C–PdII species using a strong oxidant, peroxide, which
报道了钯催化分子内异吲哚满酮形成的氨基氧合反应,其中氧原子为1个大气压。可以使用多种官能化的烯烃和羧酸,并且观察到高收率。初步的机理研究表明,氨基氧化产物是通过使用强氧化剂过氧化物将C-Pd II物种氧化而形成的,该过氧化物是由Pd(OAc)2 / bpy / O 2 / HOAc催化系统原位产生的。
Rhodium(<scp>iii</scp>)-catalyzed diamidation of olefins <i>via</i> amidorhodation and further amidation
作者:Jinlei Wang、Guangfan Zheng、Xingwei Li
DOI:10.1039/d0cc00952k
日期:——
Rh(III)-catalyzed synthesis of vicinal diamides has been realized via elaboration of an authenticated Rh–C(sp3) species generated via initial intramolecular amidorhodation of olefins. The second amidation was achieved using both electrophilic and nucleophilic amidating reagents. The reactions proceeded under mild conditions with good yield, broad substrate scope, and excellent functional-group tolerance