Activation of the ketone of 5-cyclodecenones towards thermal transannular cyclization to give trans-hydroazulenols
作者:Weiming Fan、James B. White
DOI:10.1016/s0040-4039(97)01760-7
日期:1997.10
The cyclization of 5-cyclodecenones substituted at C2 with an alkoxy group was examined. The alkoxy group sufficiently activates the ketone to allow for transannular cyclization upon heating, leading to trans fused hydroazulenols. In the cyclization of the 6-(trimethysilyl)methyl substituted 5-cyclodecenone, the TMS of the allylsilane is retained in the product, leading to a vinylsilane product. Both
检查了在C2处被烷氧基取代的5-环癸烯的环化。烷氧基基团充分活化酮,以允许在加热时进行跨环环化,从而导致反式稠合的水azulenols。在6-(三甲基甲硅烷基)甲基取代的5-环癸烯酮的环化中,烯丙基硅烷的TMS保留在产物中,从而得到乙烯基硅烷产物。热和酸诱导的环化均导致氧取代基之间具有反式关系的产物。