Chemistry of 1,4-Dioxene; IV<sup>1</sup>. A General Method for the Preparation of 2-Oxoalkanal 1-Dithioacetals from Ketones
作者:Marcel Fétizon、Pierre Goulaouic、Issam Hanna
DOI:10.1055/s-1987-27985
日期:——
The tertiary allylic alcohols obtained from lithiated dihydro-1,4-dioxin and ketones, 2-(1-hydroxyalkyl)-5,6-dihydro-1,4-dioxins, react with 1,2-ethanedithiol and 1,3-propanedithiol in dichloromethane in the presence of catalytic amounts of ether-boron trifluoride to give, after acid hydrolysis, 2-acyl-1,3-dithiolanes or 2-acyl-1,3-dithianes, respectively, i.e., 2-oxoalkanal 1-dithioacetals.
由锂化的二氢-1,4-二噁英和酮获得的叔烯丙醇,即2-(1-羟基烷基)-5,6-二氢-1,4-二噁英,在二氯甲烷中与1,2-乙二硫醇和1,3-丙二硫醇反应,并在催化量的乙醚-三氟化硼存在下,经过酸解后分别生成2-乙酰基-1,3-二硫烷或2-乙酰基-1,3-二硫环己烷,即2-氧代烷醛1-二硫缩醛。