1-Haloalkyl Aryl Sulfoxides as Useful Agents in Synthesis of α-Halo Ketones: A New Synthesis of α-Halo Ketones, α-Halo α,β-Unsaturated Ketones, and α-Halo Cross Dienones from Aldehydes
作者:Tsuyoshi Satoh、Norifumi Itoh、Ken-ichi Onda、Yasushi Kitoh、Koji Yamakawa
DOI:10.1246/bcsj.65.2800
日期:1992.10
α-Halo α-sulfinyl ketones were synthesized in two steps from 1-haloalkyl aryl sulfoxides and aldehydes in high yields. Desulfinylation of the α-halo α-sulfinyl ketones was performed with ethylmagnesium bromide in ether at low temperature to afford α-halo ketones via magnesium enolates in high yields. The magnesium enolate intermediates were trapped with various electrophiles such as deuterium oxide
α-卤代α-亚磺酰基酮由1-卤代烷基芳基亚砜和醛以高产率分两步合成。用乙基溴化镁在乙醚中在低温下对α-卤代α-亚磺酰基酮进行脱硫酰化,通过烯醇镁以高产率得到α-卤代酮。烯醇镁中间体被各种亲电子试剂捕获,例如氧化氘、氯甲酸乙酯和氯三甲基硅烷。用羰基化合物捕获烯醇镁中间体提供了一种新型的定向醛醇反应。α-卤代α-亚磺酰基酮的亚磺酰基在热条件下脱亚磺酰化得到α-卤代α,β-不饱和酮或α-卤代交叉二烯酮。