Tetrahedron p. 8539 - 8550 (1994)
Update date:2022-08-03
Topics:
Feixas, Joan
Capdevila, Anna
Guerrero, Angel
The selective cleavage of primary and secondary trimethylsilyl (TMS), triisopropylsilyl (TIPS), tert-butyldimethylsilyl (TBDMS) and tert-butyldiphenylsilyl (TBDPS) ethers with neutral alumina under very mild conditions is described.The method involves utilization of the support, previously activated by heating at 80 deg C/0.1 torr for 16 h and later deactivated with variable amounts of water (1.5-4.5 percent), in 50 : 1 ratio with regard to the substrate and in the presence of non-polar solvents, like hexane.The deprotection rate depends on the steric bulkiness of the silicon substituents, following the order TMS >> TBDMS ca.TIPS > TBDPS, as well as on the type of the attached carbon.The procedure can discriminate between different silyl groups located at equivalent positions of the same molecule affording the corresponding monoprotected alcohols in very good yields.
View Morewebsite:http://www.hybio.com.cn
Contact:+86 755 26588093
Address:No.9 Linkong West Street, Hengdian Street, Huangpi District, Wuhan City, China.
Chengda Pharmaceuticals Co., Ltd.
Contact:+86-573-84601188
Address:hengshan Road 5# in Jiashan, zhejiang
Contact:+86-571-87010026
Address:202, Zhenhua Road,
SHENYANG COMEBOARD TECHNOLOGY CO., LTD
Contact:+86-24-25724626
Address:Room2210,Tianbao International Building,No.8-1 Weigong South Street,Tiexi District,Shenyang,China
Yicheng Goto Pharmaceuticals Co.,Ltd.
Contact:+86 710 3423122
Address:5th Floor,East Gate of Building #2,Servo-Industrial Park,1st Qilin Road,Xiangyang,Hubei,China
Doi:10.1139/v67-353
(1967)Doi:10.1021/jo00092a019
(1994)Doi:10.1021/jo2004007
(2011)Doi:10.1016/j.jorganchem.2009.09.028
(2010)Doi:10.1080/15257779508012499
(1995)Doi:10.1002/asia.201100263
(2011)