Novel and Efficient Insertions of Carbons Carrying O-, S-, and N-Linked Substituents: Synthesis of α-Alkoxyalkyl, α-(Alkylthio)alkyl, and α-(Carbazol-9-yl)alkyl Ketones
作者:Alan R. Katritzky、Linghong Xie、Larisa Serdyuk
DOI:10.1021/jo960840p
日期:1996.1.1
A wide variety of benzotriazolyl-stabilized anions 2, obtained by the lithiation of 1-(alpha-alkoxyalkyl)-, 1-[alpha-(alkylthio)alkyl]-, and 1-[alpha-(carbazol-9-yl)alkyl]benzotriazoles 1, on reaction with aliphatic and aromatic aldehydes and ketones, followed by rearrangement induced by heating in the presence of zinc bromide, furnish one-carbon-homologated alpha-alkoxyalkyl, alpha-(alkylthio)alkyl
通过1-(α-烷氧基烷基)-,1- [α-(烷硫基)烷基]-和1- [α-(咔唑-9-基)烷基的锂化获得的各种苯并三唑基稳定的阴离子2 ]苯并三唑1,与脂肪族和芳香族醛和酮反应,然后在溴化锌存在下通过加热引发重排,提供一碳均一的α-烷氧基烷基,α-(烷硫基)烷基和α-(咔唑-简单的一锅操作中的9-基)烷基酮4收率高,区域选择性好。在数个烷氧基亚甲基插入中,中间体2-烷氧基氧杂环丁烷的收率高,这表明了重排的环氧机理,为另一类重要化合物多取代的2-烷氧基氧杂环丁烷提供了简便的方法。