Tetrahedron p. 2797 - 2806 (1978)
Update date:2022-08-04
Topics:
Franck-Neumann
Dietrich-Buchecker
The photolysis of 3,3-dimethyl-3H-pyrazoles in unsaturated solvents leads in good yields and often with high stereoselectivity, to vinylcarbene cycloadducts. This direct synthesis of vinylcyclopropanes, vinylcyclopropenes and divinylcyclopropanes shows that acyclic vinyl carbenes are not necessarily intramolecularly stabilized. They can actually be trapped by olefins, acetylenes or dienes, depending on the carbene substituents. Cyano vinyl carbenes are the most efficient intermolecular cycloaddenda examined so far, but carbalkoxy and even ketovinylcarbenes can undergo cyclopropanation reactions with dienes, with little competition from the Wolff rearrangement in the last case.
View MoreHANGZHOU FOREWIN PHARMA CO., LTD
Contact:+86-571-89053961
Address:hangzhou
Guangxi Nanning Guangtai Agriculture Chemical Co.,Ltd
Contact:+86-771-2311266
Address:Room703,Building12, Software Park Phase II,NO.68,Keyuan Road,Nanning City,Guangxi,China
website:http://www.josunpharma.com
Contact:+86-311-80715268 80766839
Address:No.39, Zhaiying Street, Shijaizhuang,Hebei,China
Shanghai Mintchem Development ., Ltd
Contact:0086 21 5190 8570
Address:R602,4#,89Nong, Mudan Road Pudong Shanghai China
Jiangxi Lanqi Fine Chemical S&T Co., Ltd.
Contact:+86-21-64891143
Address:XinJiShan Industrial Area, Zhangshu City, JiangXi Province, China
Doi:10.1016/S0040-4039(00)00470-6
(2000)Doi:10.1021/ol401922r
(2013)Doi:10.1021/ol402268g
(2013)Doi:10.1139/v92-171
(1992)Doi:10.1039/c3gc40991k
(2013)Doi:10.1039/C6OB02195F
(2017)