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 MoreAnhui Redstar Pharmaceutical Corp., Ltd
Contact:+86-563-5120837
Address:Jingxian Industrial Development Zone, Anhui , China
Xi'an Unique Electronic and Chemical Co., Ltd.
Contact:+86-029-88238008
Address:1703# B BUILDING WEST ELECTRONIC ZONE, XI'AN, CHINA
ZUNYI CITY BEI YUAN CHEMICAL CO., LTD
website:http://www.china-beiyuan.com
Contact:+86-851-27751258
Address:Wujiang Building, Xianggang Road, Zunyi City, Guizhou Province, China
Tianjin Anda North Industrial & Business Co.Ltd.
Contact:86-22-24999306
Address:No.11 Erwei Road,Dongli Development Area,Tianjin,China
Jiangsu Fengshan Group Co., Ltd.
Contact:86-25-86558671
Address:1903,Central International Mansion 105-6 North Zhongshan Road, Nanjing, 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)