1,3-Dichloro-5,5-Dimethylhydantoin (DCH) and Trichloromelamine (TCM) as Efficient Catalysts for the Chemoselective Trimethylsilylation of Hydroxyl Group with 1,1,1,3,3,3-Hexamethyldisilazane (HMDS) Under Mild Conditions
作者:Arash Ghorbani-Choghamarani、Kamal Amani、Mohammad Ali Zolfigol、Maryam Hajjami、Roia Ayazi-Nasrabadi
DOI:10.1002/jccs.200900037
日期:2009.4
A highly convenient method for the trimethylsilylation of alcohols and phenols via treatment by hexamethyldisilazane in the presence of 1,3–dichloro‐5,5–dimethylhydantoin (DCH) and/or trichloromelamine (TCM) as a catalyst has been developed. A wide variety of hydroxylgroups were selectively protected in CH2Cl2/CH3CN undermildconditions.
Chemoselective trimethylsilylation and tetrahydropyranylation of benzylic and primary and secondary aliphatic alcohols proceed efficiently in the presence of 1,3-dibromo-5,5-dimethylhydantoin (DBH) under mild and completely heterogeneous reaction conditions in excellent yields.
Trimethylsilylation of Hydroxyl Group with 1,1,1,3,3,3-Hexamethyldisilazane (HMDS) Catalyzed by Tribromomelamine (TBM)
作者:Arash Ghorbani-Choghamarani、Mohammad Ali Zolfigol、Maryam Hajjami、Shila Jafari
DOI:10.1002/jccs.200800180
日期:2008.12
Tribromomelamine (TBM) can be used as a novel catalyst for the trimethylsilylation of alcohols and phenols with 1,1,1,3,3,3-hexamethyldisilazane (HMDS). A wide variety of hydroxylgroups were selectively protected in CH 2 Cl 2 /CH 3 CN undermildconditions.
Poly(4-vinylpyridine) catalyzed chemoselective O-TMS protection of alcohols and phenols and N-Boc protection of amines
作者:Farhad Shirini、Nader Ghaffari Khaligh
DOI:10.1007/s13738-011-0060-5
日期:2012.8
Poly(4-vinylpyridine) (PVP) acts as an efficient and reusable catalyst for the selective and efficient trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) and N-tert-butoxycarbonylation of amines with (Boc)2O. All reactions were performed under mild conditions in good to high yields.
Palladium-Catalyzed Benzylic Arylation of Pyridylmethyl Silyl Ethers: One-Pot Synthesis of Aryl(pyridyl)methanols
作者:Alexandra R. Rivero、Byeong-Seon Kim、Patrick J. Walsh
DOI:10.1021/acs.orglett.6b00450
日期:2016.4.1
An efficient palladium-catalyzeddirectarylation of pyridylmethyl silyl ethers with arylbromides is described. A Pd(OAc)2/NIXANTPHOS-based catalyst provides aryl(pyridyl)methyl alcohol derivatives in good to excellent yields (33 examples, 57–100% yield). This protocol is compatible with different silyl ether protecting groups, affording either the protected or the free alcohols in an effective one-pot