catalysts for efficient and selective alkene oxidation (epoxidation and cis‐dihydroxylation) employing hydrogenperoxide as oxidant. Complex [Fe(II)(Me,Me,HPyTACN)(CF3SO3)2] (7), was identified as the most efficient and selective cis‐dihydroxylation catalyst among the family. The high activity of 7 allows the oxidation of alkenes to proceed rapidly (30 min) at room temperature and underconditions where the
通式为[Fe(II)(R,Y,X PyTACN)(CF 3 SO 3)2 ]的铁络合物家族,其中R,Y,X PyTACN = 1‐ [2′‐(4‐Y‐6 -[X-吡啶基)甲基] -4,7-二烷基-1,4,7-三氮杂环壬烷,X和Y分别表示吡啶的4和6位上的基团,R表示在N-处的烷基取代基三氮杂双环壬烷环的4和N-7被证明是使用过氧化氢作为氧化剂进行有效且选择性的烯烃氧化(环氧化和顺式-二羟基化)的催化剂。络合物[Fe(II)(Me,Me,H PyTACN)(CF 3 SO 3)2 ](7)被认为是该家族中最有效和选择性最强的顺式-二羟基化催化剂。7的高活性使烯烃的氧化在室温下以及在不大量使用烯烃而仅是限制性试剂的条件下迅速进行(30分钟)。在3%(摩尔)的存在下7,2当量。H 2 O 2作为氧化剂,当量为15当量。在乙腈溶液中,水被烯烃顺式-二羟基化,其收率可能对于合成目的是令人感兴趣的。竞
Selective cleavage of acetals with ZnBr2 in dichloromethane
作者:Celia Ribes、Eva Falomir、Juan Murga
DOI:10.1016/j.tet.2005.10.064
日期:2006.2
A selective cleavage of acetals of 1,2- and 1,3-diols has been achieved under mild conditions using ZnBr2 in dichloromethane at room temperature. Acetal types cleavable by this procedure include benzylidene, isopropylidene and cyclohexylidene acetals. This method is compatible with several other types of hydroxyl protecting groups such as Bn, Bz, TBDPS, TIPS and TBDMS. (c) 2005 Published by Elsevier Ltd.
de Vries Erik F. J., Brussee Johannes, van der Gen Arne, J. Org. Chem, 59 (1994) N 23, S 7133- 7137
作者:de Vries Erik F. J., Brussee Johannes, van der Gen Arne
DOI:——
日期:——
Intramolecular Reductive Cleavage of tert-Butyldimethylsilyl Ethers. Selective Mono-Deprotection of Bis-Silyl-Protected Diols
作者:Erik F. J. de Vries、Johannes Brussee、Arne van der Gen
DOI:10.1021/jo00102a047
日期:1994.11
A novel and efficient method for inside selective esterification of terminal vic -diols
A novel and highly efficient procedure for insideselective esterification of terminal vic-diols has been achieved in one-pot via Yb(OTf)3-catalyzed formation and partial hydrolysis of cyclic orthoesters. This method offers several advantages including wide compatibility with acid labile functional groups, and good to high regioselectivity and yields.