Tetrahedron p. 1183 - 1190 (1980)
Update date:2022-08-05
Topics:
Kitamura, Tohru
Kawakami, Yosihide
Imagawa, Takeshi
Kawanssi, Mituyosi
Photo-induced rearrangement of 2,3-epoxy-1,4-cyclohexanediones was investigated for a synthesis of γ-alkylidene-γ-butirolactones and γ-alkylidenebutenolides.Irradiation of epoxy diketones 1 and 4 in acetone gave γ-lactones, 2 and 5, and triketones, 3 and 6.On the other hand, in CH2Cl2, EtOAc, or PhH solution epoxy diketones 1 and 4 gave only triketones, 3 and 6.Retro-Diels-Alder reaction of γ-lactones 5aE or 5aZ at 230 deg C (20 mmHg) afforded γ-alkylidenebutenolides 7aE and 7aZ in addition to anthracene.According to the procedure, butelonide 7bZ, a key intermediate for the synthesis of freelingyne, was prepared.The dramatic solvent effect in the photochemical rearrangement was also discussed.
View MoreContact:+86-710-3516804
Address:Number 83,Panggong road,Xiangcheng District,Xiangyang ,Hubei
Shanghai Sinofluoro Scientific Co., Ltd
Contact:+86-21-64279360
Address:Room 1006,Building 3,#58 East Xinjian Road, Shanghai ,201100,China,
Shijiazhuang City Xiehe Pharmaceutical Co., Ltd
Contact:+86-311-80817929
Address:Shangzhuang,Shijiazhuang,China
Jiangyin Tenghua Import&Export Co.,Ltd.
Contact:+86-510-86263875
Address:Room 402-B,9 Yanling Road, Jiangyin,Jiangsu, China
JIANGSU GRAND XINYI PHARMACEUTICAL CO.,LTD
website:http://www.xypharm.com/
Contact:+86-515-84383317
Address:Chenli Road,Costal Chemical Area Binhai,Yancheng, Jiangsu,China
Doi:10.1021/jm050050k
(2005)Doi:10.1016/S0020-1693(02)01345-2
(2003)Doi:10.1021/jo00899a014
(1975)Doi:10.1021/ja00544a018
(1980)Doi:10.1002/hlca.200290017
(2002)Doi:10.1016/j.saa.2011.08.076
(2011)
