because of their various pharmaceutical activities, though their synthetic methods had been limited. In some cases, toxic reagents, such as phosgene or carbon monoxide, are required. It was found that a silver catalyst successfully promoted the incorporation of CO2 into o-alkynylanilines to afford the corresponding benzoxazine-2-ones bearing Z exo-olefin via 6-exo-dig cyclization at the activated C–C triple
Copper-Catalyzed Annulation Cascades of Alkyne-Tethered α-Bromocarbonyls with Alkynes: An Access to Heteropolycycles
作者:Bang Liu、Jiang-Xi Yu、Yang Li、Jin-Heng Li、De-Liang He
DOI:10.1021/acs.orglett.8b00236
日期:2018.4.20
with common alkynes for the synthesis of various heteropolycycle frameworks, including 1H-benzo[de]quinolin-2(3H)-ones, 4H-dibenzo[de,g]quinolin-5(6H)-one, and benzo[de]chromen-2(3H)-one, which were constructed with high selectivity. This was achieved by two-component annulation cascades, rather than atom-transfer radical cyclization (ATRC), with alkyne-tethered α-bromocarbonyls for one-step accessing
我们在这里描述了一种新的Cu催化的,由炔烃拴在一起的α-溴羰基与常见炔烃的环合级联反应,用于合成各种杂多环骨架,包括1 H-苯并[ de ] quinolin-2(3 H)-one,4 H-二苯并以高选择性构建的[ de,g ]喹啉5(6 H)-one和苯并[ de ] chromen-2(3 H)-one。这是通过两组分环级联反应而不是原子转移自由基环化(ATRC)来实现的,炔烃系链的α-溴羰基化合物可通过C-Br键拆分,分子内环化,分子间[4 + 2]一步进入杂多环。环和芳基C(sp 2)–H功能化级联。
1‐Bromo‐2‐(cyclopropylidenemethyl)benzene: A Useful Building Block in the Palladium‐Catalyzed Reaction of 2‐Alkynylbenzenamine
A novel palladium‐catalyzed domino reaction of 1‐bromo‐2‐(cyclopropylidenemethyl)benzene and 2‐alkynylbenzenamine is reported, which generates 2‐(naphthalen‐2‐yl)benzenamines and 5H‐indeno[1,2‐c]quinolines via 6‐endo and 5‐exo cyclization, respectively. The regioselectivity for the final outcome can be affected by phosphine and N‐heterocyclic carbene ligands.
报道了一种新型的钯催化的1-溴-2-(环亚丙基甲基)苯与2-炔基苯甲胺的多米诺反应,该反应可生成2-(萘-2-基)苯甲胺和5 H-茚并[1,2- c ]喹啉分别通过6- end和5- exo环化。膦和N-杂环卡宾配体会影响最终结果的区域选择性。
Rhodium(III) Iodide Catalyzed Carboamination of Alkynes through C–N Bond Activation
作者:Tao Xu、XinXin Li、Qingxing Yang、Yuna Zhang
DOI:10.1055/a-2012-4835
日期:2023.3
polysubstituted indoles. The protocol features a broad substrate scope (>20 examples), good functional-group compatibility, and a low catalyst loading (5 mol% Rh). Good to excellent yields (up to 98%) were obtained. An unprecedented C–N bond-cleavage mode via a six-membered transition state σ-bond metathesis mechanism was proposed based on control experiments. A series of C3-allylated indole derivatives