作者:Alexander S. Dudnik、Todd Schwier、Vladimir Gevorgyan
DOI:10.1021/ol800229h
日期:2008.4.1
propargylic esters leading to unsymmetricallysubstituted naphthalenes has been developed. This cascade reaction involves an unprecedented tandem sequence of 1,3- and 1,2-migration of two different migrating groups. It is believed that this transformation likely proceeds via the formation of 1,3-diene intermediate or its precursor, which upon cyclization and aromatization steps transforms into the naphthalene
Gold(I)-catalyzed double migration cascades toward (1E,3E)-dienes and naphthalenes
作者:Alexander S. Dudnik、Todd Schwier、Vladimir Gevorgyan
DOI:10.1016/j.tet.2008.10.109
日期:2009.2
A novel gold(I)-catalyzed cascade cycloisomerization of a variety of propargylic esters leading to unsymmetrically substituted naphthalenes has been developed. This domino process involves an unprecedented tandem sequence of 1,3- and 1,2-migrations of two substantially different migrating groups. It is believed that this transformation proceeds via formation of 1,3-diene intermediate or its equivalent
Rearrangements and Stereomutations of Metallacycles Derived from Allenes and Imidozirconium Complexes
作者:Forrest E. Michael、Andrew P. Duncan、Zachary K. Sweeney、Robert G. Bergman
DOI:10.1021/ja045607k
日期:2005.2.1
azametallacyclobutenes generated via [2+2] cycloaddition of allenes and imidozirconium complexes have been studied. Metallacycles derivedfromallenes bearing beta-hydrogen atoms racemize at room temperature by reversible beta-hydride elimination, a process which is also responsible for their eventual conversion to monoazadiene complexes. Metallacycles derivedfrom diarylallenes racemize by reversible thermal bond
Mechanisms of Allene Stereoinversion by Imidozirconium Complexes
作者:Forrest E. Michael、Andrew P. Duncan、Zachary K. Sweeney、Robert G. Bergman
DOI:10.1021/ja0348389
日期:2003.6.1
stereochemical behavior of metallacycles derived from [2 + 2] cycloaddition of enantioenriched allenes with chiral and achiral imidozirconocene complexes. Relative rates of metallacycle racemization were measured by circular dichroism, and intermediates in the selective stereoinversion of diphenylallene with a chiral imidozirconium complex were observed by NMR spectroscopy. Metallacycles derived from dialkylallenes
Generation of simple enols in non-aqueous solution by fast double-bond migration of allylic alcohols with rhodium(I) and iridium(I) complexes
作者:Chong Shik Chin、Byeongno Lee、Sangtae Kim、Jongpil Chun
DOI:10.1039/dt9910000443
日期:——
5-diene), rapidly catalyse the double-bond migration of 2-ethylprop-2-en-1-ol 3 and prop-2-en-1-ol 4, respectively to generate a significant amount of the enols 2-methylbut-1-en-1-ol 5 and prop-1-en-1-ol 6 in the absence of a solvent and in CD3COCD3. Both enols 5 and 6 are quite stable and slowly undergo ketonization to the corresponding carbonyl compounds at room temperature in the absence of a solvent and