tryptamine derivativesemploying a combination of alkynes and sulfonyl azides as readily accessible aminoethylating agents. The reaction features a successful integration of copper‐catalyzed alkyne and azide cycloaddition to N‐sulfonyl‐1,2,3‐triazole, rhodium‐catalyzed selective insertion of α‐iminocarbenes onto the C3H bond of indoles, and reduction of the resultant enamides to tryptamine derivatives employing
Formal Allylation and Enantioselective Cyclopropanation of Donor/Acceptor Rhodium(II) Azavinyl Carbenes
作者:Zhili Liu、Lianfen Chen、Dong Zhu、Shifa Zhu
DOI:10.1021/acs.orglett.0c04251
日期:2021.2.19
es with alkenes under rhodium(II) catalysis is reported. Various allyl dihydronaphthalene derivatives were furnished via rhodium(II) azavinyl carbenes with moderate to good yields and excellent chemoselectivity. When monosubstituted alkenes are used, cyclopropanation occurs and good to excellent enantioselectivities have been achieved. Particularly noteworthy is the allylic C(sp2)–H activation instead
Amine-Catalyzed [3+2] Huisgen Cycloaddition Strategy for the Efficient Assembly of Highly Substituted 1,2,3-Triazoles
作者:Lei Wang、Shiyong Peng、Lee Jin Tu Danence、Yaojun Gao、Jian Wang
DOI:10.1002/chem.201103393
日期:2012.5.7
has been utilized to fully promote the Huisgen [3+2] cycloaddition with a broad spectrum of carbonyl compounds and azides, thereby permitting the efficient assembly of a vast pool of highly substituted 1,2,3‐triazoles. In particular, the employment of commonly used and commercially available carbonyl compounds has resulted in the introduction of a diverse set of functional groups, such as alkyl, aryl
Synthesis of 2-Alkoxyaryl-2-aryl Enamines via Tandem Copper-Catalyzed Cycloaddition and Rhodium-Catalyzed Alkoxyarylation from Alkynes, <i>N</i>-Sulfonyl Azides, and Aryl Ethers
作者:Seohyun Shin、Youngchul Park、Cheol-Eui Kim、Jeong-Yu Son、Phil Ho Lee
DOI:10.1021/acs.joc.5b00891
日期:2015.6.5
synthetic route to a wide range of 2-alkoxyaryl-2-aryl enamines is developed from Rh-catalyzed alkoxyarylation of N-sulfonyl-4-aryl-1,2,3-triazoles with aryl ethers via the elimination of nitrogen molecule. In addition, 2-alkoxyaryl-2-aryl enamines are prepared via tandem Cu-catalyzed cycloaddition and Rh-catalyzed alkoxyarylation starting from alkynes, N-sulfonyl azides, and aryl ethers in one-pot.
Unexpected O–H Insertion of Rhodium-Azavinylcarbenes with <i>N</i>-Acylhydrazones: Divergent Synthesis of 3,6-Disubstituted- and 3,5,6-Trisubstituted-1,2,4-Triazines
作者:Jiang Meng、Min Wen、Shiwei Zhang、Peiwen Pan、Xingxin Yu、Wei-Ping Deng
DOI:10.1021/acs.joc.6b02846
日期:2017.2.3
efficient method for divergent synthesis of 3,6-disubstituted- and 3,5,6-trisubstituted-1,2,4-triazines via unexpected rhodium-catalyzed O–H insertion/rearrangement/conditions-controlled intramolecularcyclization and oxidation reaction under mild conditions has been developed. Notably, it is the first example for the synthesis of 1,2,4-triazines with different substituted-patterns via a common intermediate