Acid-induced transannular cyclization of 2-methyl- and 10-methyl-5-cyclodecenone
作者:Yongliang Chu、James B White、Brian A Duclos
DOI:10.1016/s0040-4039(01)00618-9
日期:2001.6
2-Methyl- and 10-methyl-5-cyclodecenone were made by anionic oxy-Cope rearrangement of the corresponding 1,2-divinylcyclohexanols, and their transannularcyclizations were induced using trifluoroacetic acid. In each case, a single diastereomer of a trans fused bicyclo[4.4.0]decan-1-ol with an equatorial methyl group was isolated. The methyl substituent at C2 or C10 of the 5-cyclodecenone did not alter
Construction of Bicyclic Ring Systems via a Transannular SmI<sub>2</sub>-Mediated Ketone−Olefin Cyclization Strategy
作者:Gary A. Molander、Barbara Czakó、Michael Rheam
DOI:10.1021/jo062292d
日期:2007.3.1
cyclooctene, cyclodecene, and cycloundecene derivatives revealed that the process proceeds with high yield and diastereoselectivity, and in the case of larger ring-sized compounds, with excellent regioselectivity. The regioselectivity of the annulation process could be rationalized based on examining the low energy conformations of the keto alkene starting materials. These results demonstrate the efficiency
Carbocyclic ring expansion reactions via free radical pathways - part III
作者:Jack E. Baldwin、Robert M. Adlington、Rajinder Singh
DOI:10.1016/0040-4020(92)85014-6
日期:1992.1
The freeradical ring expansion methodology recently described1, leading to the formation of medium sized ring ketones from cyclohexanone precursors has been applied to different side chains and ring sizes. In addition precursors based on lactone rings have been prepared and subjected to radical forming reaction conditions.