Rhenium-Catalyzed 1,3-Isomerization of Allylic Alcohols: Scope and Chirality Transfer
作者:Christie Morrill、Gregory L. Beutner、Robert H. Grubbs
DOI:10.1021/jo061436l
日期:2006.9.1
The scope of the triphenylsilyl perrhennate (O3ReOSiPh3, 1) catalyzed 1,3-isomerization of allylicalcohols has been thoroughly explored. It was found to be effective for a wide variety of secondary and tertiary allylicalcohol substrates bearing aryl, alkyl, and cyano substituents. Two general reaction types were found which gave high levels of product selectivity: those driven by formation of an
Lewis acid-catalyzed oxidative rearrangement of tertiary allylic alcohols mediated by TEMPO
作者:Jean-Michel Vatèle
DOI:10.1016/j.tet.2009.11.104
日期:2010.1
Two methods for the oxidative rearrangement of tertiary allylic alcohols have been developed. Most of tertiary allylic alcohols studied were oxidized to their corresponding transposed carbonyl derivatives in excellent to fair yields by reaction with TEMPO in combination with PhIO and Bi(OTf)3 or copper (II) chloride in the presence or not of oxygen. Other primary oxidants of TEMPO such as PhI(OAc)2
Copper-Catalyzed Aerobic Oxidative Rearrangement of Tertiary Allylic Alcohols Mediated by TEMPO
作者:Jean-Michel Vatèle
DOI:10.1055/s-0029-1217545
日期:2009.8
A mild method for the oxidativerearrangement of tertiary allylic alcohols to β-substituted enones using a TEMPO/CuCl 2 system, in the presence of molecular sieves, is described. Depending on the substrate, CuCl 2 was used in either a catalytic amount under an oxygen atmosphere or stoichiometrically.
Lewis Acid promoted Oxidative
Rearrangement of Tertiary Allylic Alcohols with the PhIO/TEMPO
System
作者:Jean-Michel Vatèle
DOI:10.1055/s-2008-1078500
日期:——
catalyzed oxidativerearrangement of tertiary allylic alcohols to β-disubstituted enones by the TEMPO/PhIO system is described. Bismuth triflate was found to be the most efficient catalyst for the majority of the substrates tested except for tertiary vinyl carbinols which could be transformed to enals in fair yields only when Re 2 O 7 was used as catalyst. A plausible mechanism for this oxidative rearrangement
描述了一种温和且环境友好的方法,用于路易斯酸催化叔烯丙醇氧化重排为 TEMPO/PhIO 系统的 β-二取代烯酮。发现三氟甲磺酸铋是大多数测试底物的最有效催化剂,但叔乙烯基甲醇除外,只有当使用 Re 2 O 7 作为催化剂时,叔乙烯基甲醇才能以合理的产率转化为烯醛。讨论了这种氧化重排的合理机制。
Highly Selective 1,3-Isomerization of Allylic Alcohols via Rhenium Oxo Catalysis
作者:Christie Morrill、Robert H. Grubbs
DOI:10.1021/ja044054a
日期:2005.3.9
strategies are developed to promote the highlyselective 1,3-isomerization of a variety of allylic alcohols using O3ReOSiPh3 as a catalyst. The first strategy utilizes substrates whose 1,3-regioisomer contains a conjugated alkene, which relies on thermodynamics to obtain high selectivity. The second strategy employs N,O-bis(trimethylsilyl)acetamide as an additive to selectively and irreversibly remove the product